The evolution of tiny, shelled sea creatures ended a 200 million year era of extreme ice ages and has protected the Earth from any repeat ever since, suggest the results of a new modelling study.
During the frozen period, known as "snowball Earth" the polar ice caps extended far down into low latitudes, covering much of the planet.
1 comment:
lets have this globalwarming awareness2007 a way to save the earth. goodluck
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