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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
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
slide10

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

slide11

The widths of a shelf are directly related to “plate activity”.

  • Narrow shelves are close to plate boundaries.
  • Wide shelves are located further away from the plate boundaries.
shelf averages

Average:

  • 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

They receive nutrient-rich sediments from the continents.

  • These waters are shallow, light penetrates to the bottom.
  • Home to 80% Earth’s flora & fauna and yields 90% of the worlds harvest of fish & shellfish.
  • Source of oil, natural gas and minerals.
Importance of the Continental Shelf
continental slope

The part of the 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

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

(12,000 ft.) deep.

Submarine Canyons
slide18

West coast

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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