The great Rift Valley in Africa is a land feature on earths surface caused by the movement of crystal plates. Continued movement of the plates is gradually making the rift deeper. How are the plates around the great Rift Valley moving?

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time