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Snap, crackle, pop, boom

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Flying over the Greenland Ice Sheet several days ago, scientist Mark Behn was surprised to see South Lake still full of sapphire-blue water. The 2- to 3-kilometer-wide lake forms each spring and summer, fed by melting ice. The water eventually builds up so much weight that it cracks the ice at the bottom of the lake, and the water drains away through the ice. That should have already happened by now.

Mark was thrilled to see the still-brimming lake. Rarely have scientists had an opportunity to witness a draining lake, which is why they put many instruments around the lakes to capture the action while they are not there. Mark and his colleagues had just gotten word that another lake they were scheduled to visit, North Lake, had just drained. 

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