1. Continental Shelf
Gently sloping, shallow area of the ocean floor that extends outward 3 – 1,300 km from the edge of a continent.

2. Continental Slope
An incline leading down from edge of continental shelf, at a depth of about 130 meters.

3. Sea Mounts
Mountains entirely underwater. Some have flat tops because their peaks have eroded away.

4. Mid Ocean Ridge
An 80,000 km long range of mountains that winds around Earth; has many peaks along both sides of a central valley.

5. Volcanic Island
When volcanoes on the ocean floor erupt, they can create mountains so high that their peaks break the surface of the ocean.

6. Trenches
A steep-sided canyon in the ocean floor so deep that you can’t see the bottom.

7. Ocean floor between the continental slope and the abyssal plain.
Continental Rise
Ocean floor between the continental slope and the abyssal plain.

8. A broad area covered with thick layers of mud
Abyssal Plain
A broad area covered with thick layers of mud
(sediment formed by the sunken remains of dead organisms from the surface)