How do rock fractures cause vibrations?

What is the general rule about surface currents? cold water flows along the ocean floor towards the equator. the east coasts of continents have cold surface currents, and the west coasts of continents have warm surface currents. seasonal and constant offshore winds create significant upwelling along the west coasts of south and north america and africa. the west coasts of continents have cold surface currents, and the east coasts of continents have warm surface currents.

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

Under which condition below would u expect a coarse-grained intrusive rock like diorite to form?