When scientists talk about the cryosphere, they mean the places on Earth where water is in its solid form, frozen into ice or snow. Read more ...
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Chatter marks are a series of often crescent-shaped gauges chipped out of the bedrock as a glacier drags rock fragments underneath it.
These chatter marks from Greenland show the characteristic crescent-shaped marks caused when glacial ice drags rocks and debris underneath it. These chattermarks are about 15 centimeters (6 inches) across. —Credit: Mike Hughes
Chatter marks and glacial striations are often found together, as seen on the Niagara Dolomite in the eastern Upper Peninsula, Michigan. —Credit: Ron Schott