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Ocean Topography. t opo= a place graphy= write. Why do we care?. Curiosity Understanding oceanic life Understanding natural disasters like : tsunami, earthquakes Locating natural resources. Ocean Topography.

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Ocean topography

Ocean Topography

topo= a place graphy= write



Ocean topography1

  • Curiosity

  • Understanding oceanic life

  • Understanding natural disasters like:

    tsunami, earthquakes

  • Locating natural resources

Ocean Topography



Survey of oceanic landforms
Survey of oceanic landforms meters below sea level.



Continental margin

That part of the continental landmass that extends from the lowest- low tide line to where it drops steeply to the ocean floor.

It includes the shelf, slope and rise.

Continental Margin


Continental shelf

The shallow submerged extension of the continent- thick crust made of granite which is less dense than the ocean (basaltic) crust.

They can have hills, depressions, sedimentary rocks, and minerals and oil deposits similar to those on the continent.

Composes 7.4% of the earth’s ocean area.

Continental Shelf



Shelves are generally a been found on the ocean floor?flat, gentle terrain. This landform is characterized by periods of erosion followed by periods of sedimentation as the sea rises and falls.




Shelf averages

Average: activity”.

  • Slope- 1.9 m (10 ft.)

  • Depth- 35 m

    greatest- Antarctica (350m)

  • Width- varies 10 m – 1,300 km

    widest- Arctic ocean (Siberia) East coast of N. A.

    narrowest- W. coast of North and

    South America

Shelf Averages


Importance of the continental shelf

Importance of the Continental Shelf


Continental slope

The part of the activity”.margin where the terrain takes a more rapid descent.

It is usually narrow ranging from 6- 60 miles.

W. Florida (Gulf) the slope is almost vertical.

Off of Santiago, Chile- another steep drop.

Continental Slope


Submarine canyon

Deep V- shaped cuts in the continental slope. Found near the mouths of large rivers. Up to 1 mile deep.

Origins-

  • Ancient river channels

  • Extensions of canyons on land.

Submarine Canyon


Submarine canyons

East coast mouths of large rivers. Up to

– Hudson Canyon – 161 km (100 mi,) & approx. 3,658 m

(12,000 ft.) deep.

Submarine Canyons


West coast mouths of large rivers. Up to

These canyons are rugged and twisted.

Monterey Canyon- one of the most spectacular in the

world. 97 K long (60 miles) & reaching

depths of 3,048 m ( 10,000 ft.).


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