The Seafloor

Petroleum and coal can be mined from the continental shelf.

Magma from Earth's interior oozes from the cracks at mid-ocean ridges.

occur at underwater subduction zones

site of sea-floor spreading

All of the following statements are true of mining minerals from the ocean EXCEPT:

It is less expensive to mine minerals from deep-water deposits than from continental shelf deposits.

Every year, plates under the ocean move approximately a. 1-2 centimeters c. 1-2 yards b. 1-2 feet d. 1-2 miles

Magma from Earth's interior oozes from the cracks at mid-ocean ridges.

Which of the following can occur next to the continental shelf? a. trench c. mid-ocean ridge b. continental slope d. all of the above

A mid-ocean ridge forms at what type of plate boundary? a. convergent c. strike-slip b. divergent d. parallel