Snowball Earth

Snowball Earth

Some scientists have proposed that earth froze completely about 650 million years ago. Proponents of the Snowball Earth hypothesis argue that it best explains a billion missing years in earth's rock layers. They argue that miles of ice eroded those rock layers and sent the sediment into the oceans where they were plunged back into the mantle to be recycled. There are also very few fossil layers before this period.

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Categories: SpaceWorld

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