Delta

The transcript explains the formation of river deltas, where a river meets a large water body, slowing down and depositing sediment in a triangular area. The Nile Delta is highlighted as a typical example. The term 'delta' originates from the Greek letter due to its shape.

From which language does the term 'delta' originate, and what does it refer to?

Explain the significance of the triangular shape in relation to river deltas.