Which of the following statements are
accurate in regards to the Columbus
Exchange?

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

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?