Sediment are being deposited at the mouth of a river to form a delta because the river slows down and energy.

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Explanation:

When large amounts of alluvium are deposited at the mouth of a river, a delta is formed. The river slows down at the mouth, so it doesn't have the energy to carry all the silt, sand, and clay anymore. These sediments form the flat, usually triangle-shaped land of a delta.

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