The Snowball Earth Hypothesis
Snowball Earth is a strongly disputed hypothesis developed to explain sedimentary glacial deposits at tropical latitudes from the Cryogenian period. The hypothesis proposes that, about 800 million years ago, the Earth was entirely covered with ice and that multicellular evolution accelerated when the climate began to warm up. Some dispute the feasibility of an entirely frozen ocean and prefer a “slushball” scenario to explain the ice's rapid movement.
