Q: What type of forces are involved when deposited rock forms deltas or barrier islands?


Read this paragraph and choose the correct option from the provided answers:

Rivers and streams flow across continents. They cut away at rock, forming river valleys ( Figure below ). These are destructive forces. The bits and pieces of rock carried by rivers are deposited where rivers meet the oceans. These can form deltas, like the Mississippi River delta. They can also form barrier islands, like Padre Island in Texas. Rivers bring sand to the shore, which forms our beaches. These are constructive forces.

 Choices:

- gravity forces

- accumulation forces

- matter forces

- constructive forces


A:
constructive forces