Abroad, ramp-like accumulation of sediment called a(n) is found downstream from the end moraine of a glacier.
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(earth science)

Outwash plains
these are large areas of glacial sediment deposited by  melt water  streams furthest away  from the glacial snout. they are formed from gravels, sands and clays, the clays being furthest away from the snout because the smaller particles are carried furthest.

There are no metaphors.