Test your knowledge on explaining and describing cirques

when nivation hollows become deep enough to form glacial ice  by plucking as the moving glacier pulls weathered rock from the bedrock  through abrasion  where abrasion rates are lower  by freeze-thaw 

Cirques form in the high peaks    . Over time glacial ice accumulates and erodes the hollow. The steep back wall is eroded    . The mass of ice increases the depth of the hollow    . The cirque develops an armchair shaped cross-section with a rising rock lip    . The circque can grow further     as meltwater enters the bergschrund crevasse.



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