Why are earth's continental plates continually in motion?

Relatively steep zone that is compared with the shelf that marks the boundary between continental crust and ocean crust.

Most countries in the middle east must import a majority of their a. gasoline b. oil c. food d. water

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.