Will give 10 pts which statements best describe how the great rift valley in africa formed? check all that apply. the rift valley formed when the crust pulled apart. the rift valley formed at a divergent boundary. the rift valley formed similarly to an island arc. the rift valley formed at a convergent boundary. the rift valley formed when tectonic plates separated.

Humans have built artificial levees along the mississippi river to protect themselves and their property from floods. however, these structures also modify inland and coastal regions by disrupting the natural flow of sediment. artificial levees along the mississippi river a. reduce the amount of sediment deposited on floodplains and increase the amount of sediment deposited at the river's mouth. b. increase the amount of sediment deposited on floodplains and decrease the amount of sediment deposited at the river's mouth. c. increase the amount of sediment deposited on floodplains and at the river's mouth. d. decrease the amount of sediment deposited on floodplains and at the river's mouth.