What is the primary purpose of us military bases around the world?

Which numberline shows the solution to n -3

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Compared with the land in the highlands, the lowlands region of england a) rockier and more difficult for farmingb) the center of business and industryc)richer in coal reservesd)covered by more fertile farmland d) covered by more fertile farmland