Sudden draining of glacial lakes explained

In 2008 scientists documented for the first time how the icy bottoms of lakes atop the Greenland Ice Sheet can crack open suddenly -- draining the lakes completely within hours and sending torrents of water to the base of the ice sheet thousands of feet below. Now they have found a surprising mechanism that triggers the cracks.

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