source: The sheer weight of the continental icecap sitting on top of Lake Vostok is believed to contribute to the high oxygen concentration.
target: High oxygen concentration is caused from the weight of the icecap on Lake Vostok.
references: High oxygen concentration is caused from the weight of the icecap on Lake Vostok. The icecap sitting on top of Lake Vostok is believed to be the cause of the high oxygen concentration. The weight of the continental icecap  on top of Lake Vostok is thought to cause  the high oxygen concentration. The continental icecap on top of Lake Vostok weighs a lot. People think that its weight increases the oxygen in the water. The weight of the icecap on Lake Vostok contributes to the high oxygen concentration. The weight of the continental icecap on Lake Vostok is thought to contribute to the high oxygen concentration. The total weight of the continental icecap sitting on top of Lake Vostok is thought to contribute to the high oxygen concentration. The weight of the continental icecap on Lake Vostok contributes to the high oxygen concentration. The continental icecap on top of Lake Vostok contributes to the high oxygen concentration. The high oxygen in Lake Vostok is because of the weight of the continental icecap that sits on top.