Explosive underwater volcanoes were a major feature of 'Snowball Earth'

Around 720-640 million years ago, much of the Earth's surface was covered in ice during a glaciation that lasted millions of years. Explosive underwater volcanoes were a major feature of this 'Snowball Earth,' according to new research.

from Oceanography News -- ScienceDaily http://ift.tt/1Jeadmk
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