Which physical geographic feature has created a north/south division in the settlement pattern of Africa?

Which of the following terms describes the layers of air surrounding the earth ?

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit