Why did jonghyun go so early? why did we have to lose him?

Which of the layers of the earth has the following three characteristics? i. it is made of molten rock. ii. it has currents that are constantly moving. iii. earth’s plates float on top of its currents.

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

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade