The buildup of a broad, gently sloping apron of sand and gravel beyond a glacier's margin, deposited by meltwater streams as they lose velocity and drop their sediment load upon leaving the confines of the ice. Outwash plains often grade seamlessly from a terminal moraine into flat, fertile lowland.
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1. Outwash plain - Wikipedia
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An outwash plain, also called a sandur (plural: sandurs), sandr or sandar, is a plain formed of glaciofluvial deposits due to meltwater outwash at the terminus of a glacier.
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