kettle hole

noun Geology.
1.
a deep, kettle-shaped depression in glacial drift.
2.
pothole ( def 3 ).
Also called kettle.


Origin:
1880–85

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Collins
World English Dictionary
kettle hole
 
n
Often shortened to: kettle a round hollow formed by the melting of a mass of buried ice

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  kettle hole
Part of Speech:  n
Definition:  a hollow filled to make a lake, due to the melting of a glacial deposit over time
Usage:  geol.
Dictionary.com's 21st Century Lexicon
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Encyclopedia Britannica
Encyclopedia

kettle hole

in geology, depression in a glacial outwash drift made by the melting of a detached mass of glacial ice that became wholly or partly buried. The occurrence of these stranded ice masses is thought to be the result of gradual accumulation of outwash atop the irregular glacier terminus. Kettles may range in size from 5 m (15 feet) to 13 km (8 miles) in diameter and up to 45 m in depth. When filled with water they are called kettle lakes. Most kettles are circular in shape because melting blocks of ice tend to become rounded; distorted or branching depressions may result from extremely irregular ice masses

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When one such block finally melted, the kettle hole was left in its place.
There are numerous kettle hole ponds, swamps, and bogs.
When a kettle hole went below the water table, a kettle pond was established as
  the steady supply of water remained in the basin.
Freshwater habitats include streams, wooded swamps, and a kettle hole pond.
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