Which process leads to delta formation at a river mouth?

Which process leads to delta formation at a river mouth?

• A. Deposition
• B. Erosion
• C. Weathering
• D. Condensation

Answer: (A)

Deposition of sediment at the river mouth creates deltas. As a river enters a slower-moving body of water, its energy drops and it can no longer carry all the sediment it loads, so particles settle out and accumulate. Over time these deposits build outward into a landform with branching channels, or distributaries, forming a delta. Erosion would remove material rather than build it, weathering breaks down rocks in place, and condensation is about atmospheric moisture, not landform creation.

Deposition of sediment at the river mouth creates deltas. As a river enters a slower-moving body of water, its energy drops and it can no longer carry all the sediment it loads, so particles settle out and accumulate. Over time these deposits build outward into a landform with branching channels, or distributaries, forming a delta. Erosion would remove material rather than build it, weathering breaks down rocks in place, and condensation is about atmospheric moisture, not landform creation.