AP BIOLOGY

Detailed explanation-1: -Delta is a “depositional feature of a river formed at the mouth of the river. These are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. It is a characteristic feature of a river in its senile stage (old).

Detailed explanation-2: -deposition on delta islands shifts from bedload of sand and gravels to suspended load, and the texture of island deposition shifts from sand to silt or clay.

Detailed explanation-3: -If the rate of sediment supply exceeds the rate of sediment removal by waves and tidal currents, a buildup of sediment occurs at river mouths. These deposits, which commonly assume triangular shapes in planar view, are termed deltas because they resemble the Greek capital letter delta (