Outwash plains usually contain a thick layer of rocks deposited close to the glacier in a layer of sand and gravel that can exceed a thickness of 330 feet.

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Outwash plains are formed by the deposition of sediment carried by meltwater streams flowing away from the glacier. The sediment can range from fine silt to large boulders, and can accumulate to a thickness of over 300 feet.

Outwash Plains Usually Contain a Thick Layer of Rocks Deposited