It’s not a tremendous amount of melt per square foot. But over an area that’s the size of two large European countries, that scales up. “What we concluded is the melting is really small—it’s like a millimeter per year,” says Siegert. “But the catchment is enormous, so you don’t need much melting. That all funnels together into this river, which is several hundred kilometers long, and it’s three times the rate of flow of the river Thames in London.”
That water is under extreme pressure, both because there’s a lot of ice pressing down from above and because there isn’t much room between the ice and the bedrock for the
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