So what exactly is a delta? A delta is a landform that is found at the lower course of the river, where the river flows into the oceans/seas. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river. River deltas form when a river carrying sediment reaches a body of standing water, such as a lake, ocean, or reservoir. When the flow enters the standing water, it is no longer confined to its channel and expands in width. This flow expansion results in a sudden decrease in the flow velocity, which diminishes the ability of the flow to transport sediments. As the velocity of the river is low, and the river have little energy left after constant erosion of the soil and the new environment that the water current is in, deposition would occur, causing boulders, rocks and pebbles to drop. When the river energy is really low, even sand, and smaller eroded particles would be deposited. Over time, all these deposition would form a landform, a piece of land, which is called the Delta.
Luke.
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