Can anyone with these 3 questions for 20 points?

Which of the following describes what rocks usually are composed of ,

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

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