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[ "cardboard is inexpensive in cost & cardboard is recyclable & cardboard is a kind of material & cardboard is biodegradable -> cardboard is a material that is recyclable, biodegradable, and inexpensive in cost", " " ]

[ "the inner core is located in the center of the earth & the pressure at the center of the earth is extremely high -> the inner core of the earth is under extremely high pressure", " the inner core of the earth is under extremely high pressure & extreme high pressure causes the inner core of earth to be in solid state -> the inner core of earth is solid", " " ]

[ "the oceanic crust mainly is made of basalt & the continental crust mainly is made of granite & basalt is more dense than granite -> the oceanic crust is more dense than the continental crust", " " ]

[ "the mantle is the largest layer of the earth & the mantle is located between the crust and the outer core -> the mantle is the largest layer of the earth located between the crust and the outer core", " " ]

[ "earthquakes causes older rock to be on top of younger rock & earthquakes cause rock layers to fold on top of each other -> earthquakes causes older rock layers to be on top of younger rock layers by folding the rock layers", " " ]

[ "the mantle of the earth is mainly made of silicate & the crust of the earth is made of basalt or granite -> the mantle of the earth is mainly made of silicate and the crust of the earth is made of basalt or ganite", " basalt is a kind of material & granite is a kind of material & silicate is a kind of material -> silicate, basalt, and granite are kinds of materials", " the mantle of the earth is mainly made of silicate and the crust of the earth is made of basalt or ganite & silicate, basalt, and granite are kinds of materials & different media are made of different materials -> the mantle and the crust are different media", " the mantle and the crust are different media & waves travel at different speed in different medium -> waves will travel at different speed in the mantle and the crust", " waves will travel at different speed in the mantle and the crust & an earthquake wave is a kind of wave -> earthquake waves will travel at different speed in the mantle and the crust", " " ]

[ "active volcanoes are most common along tectonic plate boundaries & earthquakes are most common along tectonic plate boundaries -> active volcanoes and earthquakes are most common along tectonic plate boundaries", " " ]

[ "california is located on the boundary of two tectonic plates & earthquakes are most common along tectonic plate boundaries & massachusetts is not located on the boundary of two tectonic plates -> earthquakes are more likely to occur in california than in massachusetts", " " ]

[ "all waves transmit energy from one place to another & an earthquake wave is a kind of wave -> earthquake waves transmit energy from one place to another", " " ]

[ "mountains are formed by plate tectonics & the appalachian mountains are a kind of mountain -> the appalachian mountains are formed by plate tectonics", " " ]

[ "the collision of tectonic plates are found at the convergent boundaries & the collision of the boundaries causes rocks to fold -> the collision of the tectonic plates causes rocks to fold at the convergent boundaries", " the collision of the tectonic plates causes rocks to fold at the convergent boundaries & a mountain range is formed by rocks folding upon one another -> mountains will form at the convergent boundaries by the collision of the tectonic plates", " mountains will form at the convergent boundaries by the collision of the tectonic plates & the appalachian mountains are a kind of mountain -> the appalanchian mountains are formed at the convergent boundaries by the collision of the tectonice plates", " " ]

[ "a volcanic eruption is a kind of quick process & new land can be formed by volcanoes erupting by lava cooling -> volcano eruption can quickly form a new land when lava cools down", " " ]

[ "the subduction of tectonic plates may cause magma to surface from underneath & the oceanic plate is a kind of tectonic plate -> the subduction of an oceanic plate may cause magma to surface from underneath", " the subduction of an oceanic plate may cause magma to surface from underneath & magma cools down when it comes to the surface from underneath -> the subduction of an oceanic plate will cause magma to surface and cool down", " the subduction of an oceanic plate will cause magma to surface and cool down & magma cooling can form volcanic mountains -> the subduction of an oceanic plate can form volcanic mountians", " " ]

[ "volcanic ash in the atmosphere decreases the temperature by blocking the sun & emitting sulfur dioxide causes acid rain & an erupting volcano releases sulfur gas and ash into the atmosphere -> a volcanic eruption can cause acid rain and decrease the temperature", " a volcanic eruption can cause acid rain and decrease the temperature & europe was unusally cold and had acid rain in 1783 -> a volcanic eruption may have happened to cause the cold weather and acid rain in europe", " " ]

[ "the amount of sunlight usually is the same at the locations with same latitude & the intensity of sunlight is a kind of seasonal weather pattern -> locations with same latitude has the same seasonal weather pattern of sunlight intensity", " " ]

[ "nitrogen is a kind of gas & most means over 50% of something & the earth 's atmosphere is made of 78 percent nitrogen by mass -> nitrogen gas makes up most of the earth's atmosphere", " " ]

[ "the earth 's atmosphere is made of 21 percent oxygen by volume & the earth 's atmosphere is made of 78 percent nitrogen by volume -> nitrogen and oxygen make up 99% of the earth's atmosphere by volume", " nitrogen and oxygen make up 99% of the earth's atmosphere by volume & most means over 50% of something -> nitrogen and oxygen make up most of the earth's atmosphere", " " ]

[ "the earth 's atmosphere is made of 78 percent nitrogen by volume & the earth's atmosphere is made of 04% to 1% of water vapor by volume & the earth 's atmosphere is made of 21 percent oxygen by volume & the earth 's atmosphere is made of 036 percent carbon dioxide by volume -> earth's atmosphere is made of nitrogen, oxygen, water vapor, and carbon dioxide", " " ]

[ "as altitude increases , the temperature of the air will decrease in the troposphere & an increase is the opposite of a decrease & as the altitude increases , the temperature of the air will increase in the stratosphere -> as the altitude increases, the change of air temperature are opposite in stratosphere and troposphere", " " ]

[ "the earth 's atmosphere is made of 04 to 1 percent water vapor by volume & water vapor is a kind of greenhouse gas -> water vapor is a greenhouse gas accounting for 04 to 1 percent of the earth's atmosphere", " carbon dioxide is a kind of greenhouse gas & the earth 's atmosphere is made of 036 percent carbon dioxide by volume -> carbon dioxide is a greehouse gas accounting for 0036 percent of the earth's atmosphere", " water vapor is a greenhouse gas accounting for 04 to 1 percent of the earth's atmosphere & carbon dioxide is a greehouse gas accounting for 0036 percent of the earth's atmosphere & 04 is bigger than 0036 -> water vapor is the largest amount of greenhouse gas in the atmosphere", " " ]

[ "the earth 's atmosphere is made of 78 percent nitrogen by mass & most means over 50% of something -> the earth's atmosphere is mostly made of nitrogen", " " ]

[ "aurora is a kind of atmospheric phenomena & an aurora is created by charged particles interact with magnetosphere -> an aurora is an atmospheric phenomena that is created by charged particles interacting with magnetosphere", " " ]

[ "photosynthesis is a source of oxygen & a source of something increases the amount of that something -> photosynthesis increases the amount of oxygen in the atmosphere", " photosynthesis increases the amount of oxygen in the atmosphere & the photosynthetic life performs photosynthesis -> photosynthetic life increases the amount of oxygen in the atmosphere", " early photosynthetic life is a kind of photosynthetic life & early photosynthetic life existed a long time ago -> early photosynthetic life is a kind of photosynthetic life that existed a long time ago", " photosynthetic life increases the amount of oxygen in the atmosphere & early photosynthetic life is a kind of photosynthetic life that existed a long time ago -> early photosynthetic life increased the amount of oxygen in the atmosphere a long time ago", " early photosynthetic life increased the amount of oxygen in the atmosphere a long time ago & earth had no / little oxygen a very long time ago & oxygen level describes an amount of oxygen -> early photosynthetic life increased the oxygen level in earth 's atmosphere", " " ]

[ "oceans cover 70% of the surface of the earth & most means over 50% of something -> oceans cover most of earth's surface", " oceans cover most of earth's surface & an ocean is a kind of body of water -> water covers most of earth's surface", " " ]

[ "majority means over 50% of something & earth contains glaciers / ice caps & ice caps and glaciers contain 69% of the freshwater on earth -> the majority of freshwater is found in ice caps and glaciers on earth", " " ]

[ "most means over 50% of something & ice caps and glaciers contain 69% of freshwater on earth -> ice caps and glaciers contain most of the freshwater on earth", " ice caps and glaciers contain most of the freshwater on earth & glaciers are a kind of major reservoir -> glaciers are a major reservoir that contains most of the freshwater on earth", " glaciers are a major reservoir that contains most of the freshwater on earth & ice sheet is a kind of glacier -> ice sheets are a major reservoir that contains most of the freshwater on earth", " " ]

[ "deflection is when an object changes its moving direction & the drag of wind causes the surface of the water to change its direction toward the direction of the wind -> the drag of wind causes the water to deflect toward the direction of the wind", " " ]

[ "oceans contain most of earth 's water & water is made of hydrogen and oxygen -> ocean water is made of hydrogen and oxygen", " ocean water is made of hydrogen and oxygen & oxygen is more common than hydrogen on earth -> oxygen is the most common element found in the compounds that make up ocean water", " " ]

[ "petroleum is a kind of fossil fuel & forming fossil fuels requires deposition and burial of decaying vegetation -> forming the fossil fuel petroleum requires deposition and burial of decaying vegetation", " forming the fossil fuel petroleum requires deposition and burial of decaying vegetation & vegetation is a part of the biosphere & fossil fuel is a part of the lithosphere -> the formation of petroleum cycles from biosphere to lithospehre", " " ]

[ "soil is permeable & if something is permeable , then the water will flow through something easily -> water will flow through soil easily", " " ]

[ "brown is a kind of color & color of the soil can be used to indicate the soil component & high humus content causes the soil to be brown -> if the soil has high humus content, then the soil will be brown in color", " " ]

[ "earthworms create tunnels in soil & tunnels in soil loosen that soil -> earthworms can loosen the soil", " earthworms can loosen the soil & the looseness of soil increases the ability of water to enter the soil & the looseness of soil increases the amount of oxygen in that soil -> earthworms can help increase the amount of water and oxygen in the soil", " " ]

[ "sand drains water quickly & if something drains water quickly , then that something will have little capacity to hold water -> sand has little capacity to hold water", " " ]

[ "high humus content causes the soil to be brown & humus is a source of nutrients in soil -> soil with high nutrients content will be brown", " soil with high nutrients content will be brown & color of the soil can be used to indicate the soil component -> brown color can be used to indicate the soil is high in nutrients", " " ]

[ "a plant requires nutrients to grow & soil contains nutrients for plants -> plants use the nutrients in soil to grow", " using resources decreases those resources & nutrients are a kind of resource -> using nutrients decreases those nutrients", " plants use the nutrients in soil to grow & using nutrients decreases those nutrients -> plants can decrese the nutrients in soil", " a rainforest is a kind of forest & a forest contains lots of plants / trees -> a rainforest contains lots of plants", " plants can decrese the nutrients in soil & a rainforest contains lots of plants -> the soil in a rainforest can be low in nutrients", " " ]

[ "decomposition is when a decomposer recycles nutrients from dead organisms to the soil by eating those dead organisms & decomposition increases the amount of nutrients / nitrogen in the soil -> decomposers can increase the amount of nutrients in the soil", " decomposers can increase the amount of nutrients in the soil & an earthworm is a kind of decomposer & topsoil is a kind of soil -> earthworms can increase the amount of nutrients in the topsoil", " " ]

[ "potassium is a kind of nutrient for plant growth & wildfire removes the nutrients in soil sometimes & nitrogen is a kind of nutrient for plant growth & phosphorus is a kind of nutrient for plant growth -> wildfire can remove the soil nutrients such as phosphorus, nitrogen, and potassium from soil", " wildfire can remove the soil nutrients such as phosphorus, nitrogen, and potassium from soil & if the nutrients in soil is removed , then the carrying capacity of soil for plant will be reduced -> wildfire can cause the carrying capacity of soil for plant to be reduced", " " ]

[ "decaying plant is a kind of organic matter & organic matter is a source of nutrients in soil -> decaying plant is a source of nutrients in soil", " decaying plant is a source of nutrients in soil & fertile soil has a high number of nutrients -> decaying plant can make the soil fertile", " " ]

[ "rain is a kind of precipitation & a storm is a source of precipitation -> a storm is a source of rain", " a storm is a source of rain & a thunderstorm is a kind of storm -> a thunderstorm is a source of rain", " a thunderstorm is a source of rain & cold fronts cause thunderstorms as they pass by -> cold fronts can cause thudnerstorms of rain as they pass by", " " ]

[ "prevailing westerlies are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude & united states are located in the middle latitudes between 30 and 60 degrees latitude -> prevailing westerlies are prevailing winds that move from west to east across the united states", " prevailing westerlies are prevailing winds that move from west to east across the united states & wind can make air masses to move in the same direction -> the prevailing westerlies move air masses from west to east across the united states", " the prevailing westerlies move air masses from west to east across the united states & jet streams may deflect the air masses moved by the prevailing westerlies -> the prevailing westerlies move air masses from west to east accross the united states but may be deflected by the jet streams", " " ]

[ "a storm is a source of precipitation & snow is a kind of precipitation & rain is a kind of precipitation -> a storm is a source of rain / snow", " a storm is a source of rain / snow & a thunderstorm is a kind of storm -> a thunderstorm is a source of rain / snow", " a thunderstorm is a source of rain / snow & cold fronts cause thunderstorms as they pass by -> cold fronts will cause rain / snow as they pass by", " " ]

[ "the ground radiates solar energy into air & solar energy can warm up the air -> the solar energy radiated by the ground can warm up air", " if gas is heated then that gas will rise & air is a kind of gas -> if air is heated then air will rise", " the solar energy radiated by the ground can warm up air & if air is heated then air will rise -> the solar energy radiated by the ground can cause the air to rise", " the solar energy radiated by the ground can cause the air to rise & travelling up a mountain side is a kind of rising -> the solar energy radiated by the ground can cause the air to travel up a mountain side", " " ]

[ "the air mass over the ocean is warm & the air mass formed close to the ocean is humid in moisture -> the air mass over the ocean is warm and humid", " unstable air mass can cause a thunderstorm & warm and humid air masses are usually unstable -> warm and humid air masses can cause thunderstorms", " the air mass over the ocean is warm and humid & warm and humid air masses can cause thunderstorms -> the warm and humid air mass over the ocean can cause thunderstorms", " the warm and humid air mass over the ocean can cause thunderstorms & thunderstorms are a source of rainfall -> the warm and humid air mass over the ocean can cause rainfall", " " ]

[ "mountains can cause the water in the air mass to condense & mountain is a kind of geographic obstacles -> mountain is the geographic obstacle that can cause the water in the air mass to condense", " " ]

[ "a fly is a kind of insect & rolling in mud can be used to avoid insect bites by an animal & a moose is a kind of animal -> rolling in mud can be used to avoid fly bites by a moose", " rolling in mud can be used to avoid fly bites by a moose & rolling in mud is a learned behavior -> a moose rolling in mud to avoid fly bites is a kind of learned behavior", " " ]

[ "snow is a kind of precipitation & grey clouds are a source of precipitation -> grey clouds can be a source of snow", " " ]

[ "condensation causes clouds to form & if something causes a process then that something is required for that process -> condensation is required for clouds to form", " " ]

[ "when warm air mass passes over cold air mass, the water vapor in the warm air mass will condense & a warm front is when warm air mass passes over a cold air mass -> a warm front will cause the water vapor to condense", " a warm front will cause the water vapor to condense & clouds are formed by water vapor condensing -> a warm front causes clouds to form", " a warm front causes clouds to form & cloudy means the presence of clouds in the sky -> a warm front causes the the sky to be cloudy", " a warm front causes clouds to form & clouds produce rain -> a warm front causes it to rain", " a warm front causes it to rain & if it is raining, then the weather will be rainy -> a warm front causes the weather to be rainy", " a warm front causes the the sky to be cloudy & a warm front causes the weather to be rainy -> a warm front causes cloudy and rainy weather", " " ]

[ "clouds are formed by water vapor rising into colder regions of the atmosphere and condensing & water vapor is a kind of gas -> the condensation of water vapor causes cloud to form", " " ]

[ "temperature is a measure of heat energy & condensing means a substance changes from a gas into a liquid by decreasing heat energy -> decreased temperature will cause a substance to condense from a gas to a liquid", " decreased temperature will cause a substance to condense from a gas to a liquid & water vapor is water in gas state & water droplets are water in liquid state -> decreased temperature will cause water vapor to condense to water droplets", " " ]

[ "temperature is a property of weather & the properties of something are used for describing that something & sky conditions are a property of weather -> sky and temperature are used to describe weather", " " ]

[ "the sun is the source of solar energy called sunlight & solar energy causes the weather patterns -> the sun causes the weather patterns", " " ]

[ "erosion is when wind transports sediments & sand is a kind of sediment & deposition is when wind deposits sediments -> wind erosion and deposition can transport and deposit sand", " wind erosion and deposition can transport and deposit sand & sand dunes are formed by the wind transporting and depositing sand -> sand dunes are formed by wind erosion and deposition", " " ]

[ "a landslide is when water / gravity rapidly moves rocks / soil downhill especially after a rain storm & erosion / storms can cause a landslide -> erosion causes rocks and soil to move downhill", " erosion causes rocks and soil to move downhill & a mountain is made of rocks / soil -> erosion can cause the rocks and soil on a mountain to move downhill", " " ]

[ "erosion is when moving water transports sediments from one place to another place for a long distance & flowing water is a kind of moving water -> flowing water can cause erosion", " " ]

[ "flood is the water that overflows the river bank & a riverbank is made of soil -> when it floods, water will overflow the soil on the river bank", " when it floods, water will overflow the soil on the river bank & a flood is a kind of moving water & soil erosion is when moving water moves soil from fields / environments -> a flood overflowing the riverbank will cause soil erosion", " " ]

[ "sand dunes / arches are formed by the wind transporting and depositing sand & erosion is when wind transports sediments from one place to another place for a long distance -> wind erosion can form sand dunes and arches", " " ]

[ "weather is a source of wind and water for weathering & sometimes weathering smooths / rounds rocks -> weathering by wind and water sometimes smooths rocks", " " ]

[ "erosion is when wind / moving water transports sediments from one place to another place for a long distance & sand is a kind of sediment -> erosion can transport sand from one place to another place", " erosion can transport sand from one place to another place & new sand is brought from other places and spread on the beaches -> new sand is brought to the beach by erosion", " " ]

[ "erosion usually occurs over a period of many years which is considered a long time & water causes soil and rock erosion -> water will cause erosion to the rock over a long period of time", " " ]

[ "grass is a kind of plant & in the erosion process roots of plants are an inhibitor & the grasses are removed from the land -> the inhibitor of the erosion process is removed", " the inhibitor of the erosion process is removed & the grasses are removed from the land & removing an inhibitor of a process causes that process -> removal of grasses from the land will cause erosion", " wind and rain cause erosion & soil erosion is when wind and moving water moves soil from fields / environments -> wind and rain can cause soil erosion", " removal of grasses from the land will cause erosion & wind and rain can cause soil erosion -> removal of grasses from the land will cause wind and rain to erode the soil", " " ]

[ "soil loss causes grooves in soil & soil erosion means soil loss through wind / water / animals -> soil erosion caused by water will cause grooves in soil", " soil erosion caused by water will cause grooves in soil & rainwater is a kind of water -> rainwater can cause grooves in soil", " rainwater can cause grooves in soil & a riverbank is made of soil -> rainwater can cause grooves in a riverbank", " " ]

[ "rocks interacting with moving water over long periods of time causes weathering & sometimes weathering smooths rocks -> moving water interacting with rocks would smooth the rocks", " moving water interacting with rocks would smooth the rocks & waves are made of moving water -> waves interacting with rocks can smooth rocks", " waves interacting with rocks can smooth rocks & a pebble is a kind of small rock -> waves interacting with pebbles can smooth pebbles", " " ]

[ "rain causes erosion & erosion decreases the amount of nutrients in soil -> rain can decrease the amount of nutrients in soil", " rain can decrease the amount of nutrients in soil & decreasing something can cause something to be removed -> nutrients in soil can be removed by rain", " nutrients in soil can be removed by rain & removing something is a kind of change & rain is a kind of natural process -> an example of a soil change caused by natural processes is nutrients in soil being removed by rain", " " ]

[ "erosion sometimes decreases the amount of nutrients in soil & rain causes erosion -> rain can decrease the amount of nutrients in soil", " " ]

[ "abrasion changes rocks from rough into smooth and round & abrasion is a kind of weathering -> abrasion is the kind of weathering that would change the rocks from rough into smooth and rough", " " ]

[ "a mountain range contains mountains & a mountain is made of rocks -> a mountain range contains mountains made of rocks", " a mountain range contains mountains made of rocks & sometimes weathering rounds rocks -> weathering can round the rocks in the mountain range", " " ]

[ "roots hold soil in place & if soil is held in place, then soil erosion can be prevented -> roots help prevent soil erosion by holding soil in place", " roots help prevent soil erosion by holding soil in place & removing trees will decrease the roots in the soil -> removing trees will increase soil erosion by decreasing the roots holding the soil in place", " " ]

[ "when water freezes , that water expands & if there is a crack in a rock, then water can get into the crack -> if water freezes in the crack of the rock, then water will expand in the crack", " if water freezes in the crack of the rock, then water will expand in the crack & if water expands in a crack in a rock, then the rock will break apart -> if water freezes in the crack of the rock, then the rock will break apart by water expanding when it freezes", " " ]

[ "soil is formed by weathering & weathering means breaking down rocks from a larger whole into smaller pieces -> soil is formed by breaking down rocks from a larger whole into smaller pieces", " " ]

[ "scraping an object may cause small particles to break off of that object & a rock is a kind of object -> scraping a rock may cause small particles to break off the whole rock", " scraping a rock may cause small particles to break off the whole rock & glacier may scrape rocks when it moves -> glacier can scrape a rock and cause small particles to break off the whole rock", " very small rocks / minerals are kinds of of small particles & soil is made of very small rocks / minerals -> soil is made of small particles of rock / minerals", " glacier can scrape a rock and cause small particles to break off the whole rock & soil is made of small particles of rock / minerals -> the small particles of a rock scraped by the glacier can make up soil", " " ]

[ "rocks interacting with wind and moving water over long periods of time causes weathering & weathering means breaking down rocks from a larger whole into smaller pieces by weather / mechanical means -> interacting with wind and moving water causes the rocks to be broken down from a larger whole into smaller pieces", " " ]

[ "a boulder is a kind of rock & weathering means breaking down rocks from a larger whole into smaller pieces by mechanical means -> breaking down a boulder from a larger whole into smaller pieces is an example of weathering", " breaking down a boulder from a larger whole into smaller pieces is an example of weathering & a crack is formed by breaking the whole -> cracks will be formed by the weathering of a boulder", " " ]

[ "cycles of freezing and thawing water cause ice wedging & ice wedging is a kind of mechanical weathering -> cycles of freezing and thawing water cause mechanical weathering", " cycles of freezing and thawing water cause mechanical weathering & mechanical weathering means breaking down rocks from a larger whole into smaller pieces by mechanical means -> rocks will be broken down from a larger whole into smaller pieces by cycles of freezing and thawing water", " " ]

[ "cycles of freezing and thawing water cause ice wedging & ice wedging is a kind of mechanical weathering -> cycles of freezing and thawing water cause mechanical weathering", " cycles of freezing and thawing water cause mechanical weathering & mechanical weathering means breaking down rocks from a larger whole into smaller pieces by mechanical means -> cycles of freezing and thawing water will break down rocks from larger whole into smaller pieces", " " ]

[ "ice wedging is a kind of mechanical weathering & cycles of freezing and thawing water cause ice wedging -> cycles of freezing and thawing water cause mechanical weathering", " cycles of freezing and thawing water cause mechanical weathering & mechanical weathering means breaking down rocks from a larger whole into smaller pieces by mechanical means -> cycles of freezing and thawing water cause the rocks to break into smaller pieces", " " ]

[ "oxidation of iron will change the iron to yellow, red, or orange color & chemical weathering causes iron in rock to oxidize & rocks sometimes contain iron -> chemical weathering can cause iron in rock to oxidize and change the color of the rock to yellow, red, or orange", " " ]

[ "a plant 's roots slowly break down rocks as the roots grow & weathering means breaking down rocks from a larger whole into smaller pieces by mechanical means -> a plant's roots can cause weathering on rocks", " a plant's roots can cause weathering on rocks & a plant is a kind of living thing -> a plant's roots causing weathering is an example of a living thing causing weathering", " " ]

[ "mosses produces acid from their roots & acid can cause rocks to weather by chemical reaction -> mosses can cause chemical weathering by producing acid from their roots", " " ]

[ "an example of weathering is a plant root growing into a crack in rock & a tree is a kind of plant -> a tree's root growing into a crack in rock is an example of weathering", " a plant is a kind of organism & a tree is a kind of plant -> a tree is a kind of organism", " a tree's root growing into a crack in rock is an example of weathering & a tree is a kind of organism -> a tree's root growing into a crack in rock is an example of organism causing the weathering", " a tree's root growing into a crack in rock is an example of organism causing the weathering & organic weathering means organisms cause the weathering of rocks -> a tree's root growing into a crack in rock is an example of organic weathering", " " ]

[ "moisture is a kind of environmental factor & warmth is a kind of environmental factor -> warmth and moisture are kinds of environmental factors", " warmth and moisture are kinds of environmental factors & warmth and moisture can accelerate chemical reactions -> a warm and moist environment can accelerate chemical reactions", " a warm and moist environment can accelerate chemical reactions & chemical weathering means chemical reaction causes the weathering of rocks -> a warm and moist environment can accelerate the rate of chemical weathering on rocks", " " ]

[ "an example of weathering is a plant root growing into a crack in rock & a tree is a kind of plant & a boulder is a kind of large rock -> a tree's root growing in a crack in a boulder is an example of weathering", " " ]

[ "acid produced by some trees can change the soil chemistry & a change in soil chemistry is a kind of chemical weathering -> some trees producing acid is an example of chemical weathering", " " ]

[ "acid can cause rocks to weather by chemical reaction & soil is formed by rocks weathering -> acid can form soil by weathering rocks", " acid can form soil by weathering rocks & plants can produce acid -> plants can form soil by producing acid to weather rocks", " " ]

[ "acid can cause rocks to weather by chemical reaction & chemical weathering means chemical reaction causes the weathering of rocks -> acid weathering rocks is a kind of chemical weathering", " acid weathering rocks is a kind of chemical weathering & lichens can produce acid to break down rocks -> lichens producing acid to break down rocks is an example of chemical weathering", " " ]

[ "a drought is a kind of slow environmental change & a drought occurs over a period of months / years -> a drought is an environmental change that occurs over a period of months or years", " " ]

[ "a hurricane has high wind speeds & high winds are winds with high wind speed & a tornado has high wind speeds -> both hurricanes and tornadoes have high winds", " " ]

[ "low means low in elevation / height / altitude & area means a place -> low areas means places with low elevation", " low areas means places with low elevation & as elevation of a place decreases , how much a flood will affect that place will increases -> a flood will affect low areas more than higher areas", " " ]

[ "drought is when available water decreases in an environment & plants require water to survive -> drought will decrease the water plants need to survive", " drought will decrease the water plants need to survive & plants drying out means plants do not have enough water to survive -> drought can cause plants to dry out", " drought can cause plants to dry out & drought may cause wildfires -> drought can cause plants to dry out and cause wildfires", " " ]

[ "a hurricane has large amount of rain & a hurricane has high wind speed -> a hurricane has high wind speed and large amount of rain", " rain causes erosion & wind causes erosion -> wind and rain / storms cause erosion", " a hurricane has high wind speed and large amount of rain & wind and rain / storms cause erosion -> a hurricane can cause erosion", " " ]

[ "the temperautre on lands is usually colder and less humid in moisture & moisture and warm temperature is the source of energy in hurricanes -> when a hurricane moves over land , that hurricane will decrease in strength", " when a hurricane moves over land , that hurricane will decrease in strength & a continent is a kind of large land mass -> when a hurricane moves over a continent, that hurricane will decrease in strength", " " ]

[ "disrupting something from reaching something else decreases the availability of that something & smoke from volcanic eruptions can disrupt sunlight from reaching earth 's surface -> smoke from volcanic eruptions can decrease the availability of sunlight", " smoke from volcanic eruptions can decrease the availability of sunlight & as the availability of sunlight decreases , the ability of producers to produce food decrease -> smoke from volcanic eruptions can decrease the food produced by the producers by decreasing the availability of sunlight", " smoke from volcanic eruptions can decrease the food produced by the producers by decreasing the availability of sunlight & food is a kind of resource -> smoke from vocanic eruptions can decrease resources in an area by decreasing the availability of sunlight", " " ]

[ "heat and moisture above the ocean cause the formation of a hurricane & air is above the ocean -> heat and moisture in the air above the ocean can cause the formation of a hurricane", " heat and moisture in the air above the ocean can cause the formation of a hurricane & warm means medium heat energy / temperature -> warm and moist air above the ocean can cause the formation of a hurricane", " " ]

[ "flooding decreases the availability of food & a living thing requires food for survival -> flooding can decrease the availability of food required by living things for survival", " flooding can decrease the availability of food required by living things for survival & a parrot is a kind of living thing -> flooding can decrease the availability of food required by parrots for survival", " the decrease of something required by an organism has a negative impact on that organism 's survival & a parrot is a kind of organism -> the decrease of something required by a parrot has a negative impact on that parrot's survival", " flooding can decrease the availability of food required by parrots for survival & the decrease of something required by a parrot has a negative impact on that parrot's survival -> flooding decreasing food availability has a negative impact on parrots survival", " " ]

[ "drought is when available water decreases in an environment & as the availability of water decreases, the environment will become more dry -> drought causes the environment to be dry", " drought causes the environment to be dry & dry conditions can cause fire -> drought may cause wildfires", " drought may cause wildfires & a prairie is a kind of ecosystem -> drought may cause wildfires to a prairie", " " ]

[ "humidity is a property of weather and include ordered values of dry / humid & a weather report describes weather -> a weather report will describe the humidity of weather", " a weather report will describe the humidity of weather & humidity is the amount of moisture in the air -> the weather report will decribe the amount of moisture in the air", " " ]

[ "the air mass formed close to the ocean is humid in moisture & boston is a city that is near to the coast of the atlantic ocean -> the air mass in boston will be humid in moisture", " " ]

[ "the equator receives the most amount of direct sunlight throughout the year & the poles receives the least amount of direct sunlight throughout the year -> the equator receives more direct sunlight than the poles on earth", " the equator receives more direct sunlight than the poles on earth & there is ocean found at the equator and the poles area -> the ocean at the equator will receive more direct sunlight than the ocean at the poles", " the ocean at the equator will receive more direct sunlight than the ocean at the poles & if something receives sunlight, it will absorb the sunlight -> the ocean at the equator will abosrb more direct sunlight than the ocean at the poles", " " ]

[ "the equator receives the most amount of direct sunlight throughout the year & the poles receives the least amount of direct sunlight throughout the year -> the equator receives more direct sunlight than the poles on earth", " the equator receives more direct sunlight than the poles on earth & if something receives sunlight, it will absorb the sunlight -> the equator will abosrb more direct sunlight than the poles on earth", " the equator will abosrb more direct sunlight than the poles on earth & if an object / a substance / a location absorbs solar energy then that object / that substance will increase in temperature -> the equator will have higher temperature than the poles on earth", " " ]

[ "the climate is low in humidity in nevada & lack of moisture in the air causes low amounts of rainfall -> the low humidity in nevada causes the low amounts of rainfall", " " ]