Valley Development: Formation of Geographical Features
https://www.thoughtco.com:443/valley-formation-and-development-1435365
WEBJul 19, 2019 · A valley is an extended depression in the Earth's surface that is usually bounded by hills or mountains and is normally occupied by a river or stream. Since valleys are usually occupied by a river, they can also slope down to an outlet which can be another river, a lake or the ocean.
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