erosion. weathering. conservation of soil. deposition of sediment.
I gave my students this multiple choice question: A delta can be seen from the air at the mouth of the Mississippi River. This delta was formed by

Only one answer is correct among these 4 choices:
- erosion.
- weathering.
- conservation of soil.
- deposition of sediment.

Could you tell me which one is correct?

deposition of sediment.