How do scientist use seismic waves to map earths interior

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

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.

What are the answers for the following questions?