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Home The image shows a thermokarst lake in Alaska. Thermokarst lakes form in the Arctic when permafrost thaws. (NASA/JPL-Caltech) The image shows a thermokarst lake in Alaska. Thermokarst lakes form in the Arctic when permafrost thaws. (NASA/JPL-Caltech)

The image shows a thermokarst lake in Alaska. Thermokarst lakes form in the Arctic when permafrost thaws. (NASA/JPL-Caltech)

The image shows a thermokarst lake in Alaska. Thermokarst lakes form in the Arctic when permafrost thaws. (NASA/JPL-Caltech)

The image shows a thermokarst lake in Alaska. Thermokarst lakes form in the Arctic when permafrost thaws. (NASA/JPL-Caltech)