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a flagpole is a kind of object | 1 |
a volcanic eruption is a kind of quick process | 1 |
volcano eruption is when volcano deposits lava to the earth 's surface | 1 |
new land can be formed by lava cooling after an volcano eruption | 1 |
most canyons are formed by flowing rivers | 1 |
a valley is formed by flowing rivers | 1 |
sometimes piles of rocks are formed by melting glaciers depositing rocks | 1 |
deposition is a kind of constructive force | 1 |
water deposits the leaves at the foot of the hill and fans out | 1 |
a delta is formed by sediment depositing at the mouth of a river by water fanning out | 1 |
a river is a kind of a moving body of water | 1 |
most canyons are formed by flowing rivers through erosion over long periods of time | 1 |
the grand canyon is a kind of canyon | 1 |
a river is a kind of flowing body of water | 1 |
the colorado river is a kind of river next to the grand canyon | 1 |
if something requires something else then that something else is important to that something | 1 |
the colorado river is a kind of river | 1 |
if something is formed by something else, then that something else is required by that something | 1 |
most canyons are formed by flowing rivers through erosion over long periods of time | 1 |
a dinosaur is a kind of extinct animal | 1 |
index fossils can be used to determine the approximate age of other fossils in that area | 1 |
a bone is a part of some animals | 1 |
an example of a fossil is the bones of an extinct animal | 1 |
if a species existed for a relatively short time then that species is now extinct | 1 |
index fossils are formed from species that existed for a relatively short time | 1 |
if fossils of a water animal or plant are found in a place then that animal or plant used to live in that place | 1 |
shell is a part of a mussel | 1 |
a river usually contains freshwater | 1 |
fossils of shells of freshwater mussels are found in a mountain range | 1 |
a freshwater mussel is a kind of mussel | 1 |
a mountain range is a kind of place | 1 |
a freshwater mussel is a mussel lives in freshwater | 1 |
a mussel is a kind of water animal | 1 |
a tropical environment usually has warm temperatures | 1 |
an ocean is a kind of body of water | 1 |
if fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past | 1 |
a body of water is a kind of environment | 1 |
coral lives in tropical oceans | 1 |
coral is a kind of aquatic animal | 1 |
fossils of corals are found in ohio | 1 |
a wooded area is a kind of place | 1 |
if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past | 1 |
if something used to be in the past then that something has changed | 1 |
fossils of seashells are found in a wooded area | 1 |
if fossils of an animal or plant are found in a place then that animal or plant used to live in that place | 1 |
fossils of dinosaurs are found in antarctica | 1 |
a dinosaur is a kind of reptile | 1 |
a reptile is a kind of animal | 1 |
cold-blooded animals cannot live in cold environments | 1 |
a reptile is cold-blooded | 1 |
fossils of sharks are found on top of a mountain | 1 |
sharks live in oceans | 1 |
a shark is a kind of fish | 1 |
if fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past | 1 |
the top of a mountain is a kind of place | 1 |
an ocean is a kind of body of water | 1 |
a fish is a kind of aquatic animal | 1 |
environments are found on the crustal surface of earth | 1 |
marine animals are water animals | 1 |
marine fossils means fossils of marine animals | 1 |
marine fossils are found in mountains | 1 |
if something used to be in the past then that something has changed | 1 |
if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past | 1 |
a mountain is a kind of environment | 1 |
a body of water is a kind of environment | 1 |
environments changing can cause layers of rock that are on top of each other to be of different kind | 1 |
limestone is a kind of sedimentary rock | 1 |
shale is a kind of sedimentary rock | 1 |
a layer of shale is on top of a layer of limestone | 1 |
fossils are formed when layers of sediment cover the remains of organisms over time | 1 |
a plant is a kind of organism | 1 |
an animal is a kind of organism | 1 |
if something is preserved in sedimentary rocks, then that something can be found in the sedimentary rock | 1 |
fossils are the remains of organisms or part of organisms | 1 |
organism remains can be preserved in sedimentary rock | 1 |
fossils are the remains of organisms or part of organisms | 1 |
bones are part of some animals | 1 |
plants are a kind of organism | 1 |
animals are a kind of organism | 1 |
a shell is a part of some animals | 1 |
containing fossils is a kind of characteristic of sedimentary rock | 1 |
a fossil seashell is a kind of fossil | 1 |
limestone is a kind of sedimentary rock | 1 |
nearly all fossils are found in sedimentary rock | 1 |
nearly all fossils are found in sedimentary rock | 1 |
if something is found in something else, then that something else contains that something | 1 |
fossils can be used to study the history of organisms and environments on earth | 1 |
an animal is a kind of organism | 1 |
a dinosaur is a kind of extinct animal | 1 |
the fossils of horse has shorter bones in lower levels and the fossils of horse has longer bones in the upper level | 1 |
an animal is a kind of organism | 1 |
younger layer of rocks are on top of the older layer of rocks according to superposition | 1 |
a horse is a kind of animal | 1 |
if fossils of an organism change depending on the level in which they were found then that species of organism changed over time | 1 |
a bird is a kind of animal | 1 |
if a fossil is of an organism that cannot be identified then that organism is probably extinct | 1 |
an animal is a kind of organism | 1 |
an elephant is a kind of animal species | 1 |
if the fossils of a species are different from the existing species, then the species has changed over time | 1 |
the fossil of the elephant in african savanna is different from the elephant species presently in that area | 1 |