A river delta forms at the mouth of a river where it enters a larger body of water. Usually the delta is shaped like a triangle. What process causes delta formation?(1 point)
Delta formation is primarily caused by the process of sediment deposition. As a river flows into a larger body of water, such as a lake, sea, or ocean, it gradually slows down and its velocity decreases. This decrease in velocity leads to the settling of sediments (such as sand, silt, and clay) that are carried by the river. Over time, these sediments accumulate and build up at the mouth of the river, forming a delta. The triangular shape of the delta is a result of the river's distributaries, which split and spread the sediment across the delta front.
