Antarctica ice shelves vulnerable to meltwater that could cut ice 'like a knife,' study finds

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By Cassandra Garrison BUENOS AIRES (Reuters) - Meltwater could undermine the walls of ice holding back Antarctica's glaciers, scientists reported on Wednesday, a finding that underscores concern about the potential for a significant sea level rise. The ice shelves, formed over thousands of years, serve as dams to prevent much of the continent's snow and ice from flowing toward the ocean. Scientists found that about 60% of the ice shelf area is vulnerable to a process call hydrofracturing, in which meltwater seeps into the shelves' crevasses, some of which are hundreds of meters deep, and triggers collapse. "This...

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