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 ...
On Friday, 06 February 2015 from 8:00 a.m. to 5:00 p.m. (USA Mountain Time), we will be performing scheduled maintenance, which may cause temporary disruptions to our Web site, applications, and FTP. We apologize for any inconvenience this may cause you.
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