One reason the cultures of north africa developed differently from the cultures of the rest of africa was that these areas of africa were separated by the a. arabian sea. b. sahara desert. c. congo river basin. d. great rift valley.

Eastern europe and parts of northern europe have which of the following climates?

What is the approximate chemical composition of the solar nebula?

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons