What is a River delta;How Is It Formed?

A river  delta from Greek letter D, A) is a tract of low and level land of triangular shape, formed at the mouth of a river. I t is caused by the river depositing suspended matter when it reaches the sea. As the accumulation
grows the river is blocked up. I t finds a way round the obstruction, very often on each side of it. This process is repeated again and again so that a network of channels is formed.

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