hanging-valley

hanging valley

noun
1.
a valley, the lower end of which opens high above a shore, usually caused by the rapid erosion of a cliff.
2.
a tributary valley whose mouth is set above the the floor of the main valley, usually as a result of differences in glacial erosion.

Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hanging valley
 
n
geography a tributary valley entering a main valley at a much higher level because of overdeepening of the main valley, esp by glacial erosion

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hanging valley   (hāng'ĭng)  Pronunciation Key 
A side valley that enters a main valley at an elevation high above the main valley floor. Hanging valleys are typically formed when the main valley has been widened and deepened by glacial erosion, leaving the side valley cut off abruptly from the main valley below. The steep drop from the hanging valley to the main valley floor usually creates cascading waterfalls.
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