How can sediment brought by a river affect a sea coast?

Correct answer: It can contribute to coastal deposition and delta formation

Direct answer: Option A, it can contribute to coastal deposition and delta formation. Rivers carry sand, silt, clay, and other sediment. Near the mouth, river velocity often decreases as the flow enters a wider, calmer body of water. The river then loses carrying power and deposits its load along the coast or in the sea. Continued deposition may build a delta or other coastal deposits, depending on waves, tides, and currents. A is correct. B is wrong because sediment cannot immediately dry an entire sea. C is wrong because ordinary river sediment cannot freeze all seawater. D is wrong because deposition does not turn every coast into a mountain. Memory cue: river-borne sediment reaches the mouth and may build the coast.