1. Subsurface Topography
Ocean Floor Features

2. Continental Shelf *
The gently sloping section of the continental margin located between the shoreline and the continental slope.

3. Continental Slope *
The steeply inclined section of the continental margin located between the continental rise and the continental shelf.

4. Continental Rise
The gently sloping section of the continental margin located between the continental slope and the abyssal plain.

5. Abyssal Plain *
A large, flat, almost level area of the deep-ocean basin.

6. Seamount *
A submerged mountain on the ocean floor that is at least 1,000 meters high and that has a volcanic origin.

7. Volcanic Island *
A seamount that has grown above water level.

8. Mid Ocean Ridge *
Mountain chains that form where tectonic plates pull apart. Magma rises to fill the space and new ocean crust is formed

9. Trench *
These deep cracks in the ocean floor are formed when the denser oceanic plate slides beneath the less dense continental plate.

10. Sonar
Acronym for Sound Navigation and Ranging. Used to determine the depth of the ocean.

11. Guyot
AKA- Tablemount, An isolated under water seamount at least 900m tall with a flat top over 200m below the surface of the ocean.

12. Atoll
Coral Atoll, a ring shaped coral reef including a coral rim that encircles a lagoon, partially or completely. Often sitting atop an extinct seamount or volcano

13. Island
Sub-continental land surrounded by water

14. Submarine Canyon
A steep-sided valley cut into the sea floor of the continental slope

15. Rift Valley
A crack in the ocean floor where magma rises and cools.

16. Continental slope
Continental shelf
Continental
Shelf
Volcanic island
Seamount
Continental slope
Abyssal plain
Continental rise
trench
mid-ocean ridge
Rift valley