Ice - Geophotography
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Kettle Depression

Kettle Depression

"A steep-sided, usually basin or bowl shaped hole or depression, commonly with out surface drainage, in glacial-drift deposits (Esp. outwash and kame fields), often containing a lake or swamp; formed by the melting of a large detached block of stagnent ice (left behind by a retreating glacier) that has been wholly or partially buried in glacial drift." Glossary of Geology 5th Ed.