Alluvium
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Deposits of earth, sand, gravel, and other transported matter,made by rivers, floods, or other causes, upon land not permanentlysubmerged beneath the waters of lakes or seas. Lyell.
Alluvium meaning & definition 1 of Alluvium.
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earth and sand that has been left by rivers, floods, etc.
Alluvium meaning & definition 2 of Alluvium.