kettle

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kettle

kettle, oval depression found in glacial moraines, which are landforms made up of rock debris. When a glacier melts and draws away from an area, a block of ice may break off and be covered by earth and rock. As the block melts, the ground above it subsides, forming a kettle. Kettles may be deeper than 100 ft (30 m) and more than 1 mi (1.6 km) in diameter. Pitted outwash plains contain many kettles.
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kettle

[′ked·əl]
(geology)
A bowl-shaped depression with steep sides in glacial drift deposits that is formed by the melting of glacier ice left behind by the retreating glacier and buried in the drift. Also known as kettle basin; kettle hole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.