You are presented with the question "A delta is formed by " and the following answer choices: - erosion - motion - plate shifts - flooding - loose soil - Earthworms - compression - gravity Now knowing that adelta is formed by deposition of sediment at the mouth of a river by water fanning out and erosion is responsible for wearing down exposed places and depositing sediment in level places, choose the best answer.
The answer to this question is:
erosion