Which of the following is an environmental challenge facing the Sahel? a. desertification
c. shifting agriculture
b. deforestation
d. all of the above

What causes the cyclical changes in the appearance of the moon?

Which characteristics are true of the arabian desert? multiple answers choose all answers that are correct. a. is mostly below sea level b. covers almost the entire arabian peninsula c. contains the largest sand sea in the world d. has very few people living there

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory