Physical Features of the SeaFloor

19 terms by mlister

Create a new folder

Advertisement Upgrade to remove ads

Atoll

Ring shaped island of coral reefs and coral debris; often form over sinking, inactive volcanoes

Seamount

a huge underwater volcanic mountain that may emerge from the ocean surface as an island

Abyssal Plains

Flat, sediment covered ocean floor between the continental rise and oceanic ridge

Abyssal Hills

small, sediment covered inactive volcanoes less than 200m in height.

Oceanic Trench

an arc-shaped depression in the deep ocean floor with very steep sides and a flat sediment filled bottom; associated with a subduction zone. Most occur in the Pacific Ocean

Oceanic Ridge

a continuous elevated zone on the floor of all the major ocean basins and varying in width from 500 to 5000 kilometers (300 to 3000 miles). the rifts at the crests of these ridges represent divergent plate boundaries

Guyot

a flat topped submerged inactive volcano

Hydrothermal Vent

A spring of hot, mineral- and gas-rich seawater found on some oceanic ridges in zones of active seafloor spreading.

Continental Rise

the gently sloping section of the continental margin located between the continental slope and the abyssal plain

Continental Slope

The edge of a continent that drops steeply down to the deep ocean floor

Continental margin

that portion of the seafloor adjacent to the continents. it may include the continental shelf, continental slope, and continental rise

Submarine canyon

Deep, V-shaped valley running roughly perpendicular to shoreline and cutting across the edge of the continental shelf and slope

bathymetry

the discovery and study of submerged contours

active margin

Continental margins near edges of converging plates- high earthquake and volcanic activity mainly in Pacific.

passive margin

the continental margin near an area of lithospheric plate divergence; also called Atlantic-type margin

turbidity current

Underwater "Avalanche" of abrasive sediments thought responsible for the deep sculpturing of submarine canyons and as a means for sediments accumulating on an abyssal plain

island arc

A string of islands formed by the volcanoes along a deep-ocean trench.

Continental shelf

The flat or gently sloping land that lies submerged around the edges of a continent and that extends from the shoreline out to a continental slope

Shelf break

Abrupt increase in slope at junction between continental shelf and continental slope

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set