A depression resulting from gravel building up around stagnant ice, which then melts, is a/an:

Name: A depression resulting from gravel building up around stagnant ice, which then melts, is a/an:
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A kettle is formed when a block of ice is buried in drift and then melts, creating a depression in the ground. This process often occurs in areas previously covered by glaciers, where stagnant blocks of ice were left behind as the glacier retreated.

A Depression Resulting from Gravel Building Up Around Stagnant Ice