Continental Margins.

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Presentation transcript:

Continental Margins

Oceanography Oceanography is the study of all aspects of the ocean draws on geology, chemistry, physics and biology

Sonar - Sound Navigation and Ranging 1. Works by transmitting sound waves toward the bottom of the ocean; sensitive receiver intercepts the echo reflected by the bottom 2. Speed of sound is 1500 m/s in water. 3. The depths determined from monitoring the echoes 4. Used for topographic maps Of ocean floor

The ocean floor is divided into 2 areas: Continental Margin and Ocean Basin

Continental Margin: Shallow parts of ocean made of continental crust It is not always obvious; it’s not the shoreline It is the dividing line between continental and oceanic curst.

3 Features of the Continental Margin Continental Shelf: first area of ocean floor Continental Slope: marks the area between continental and oceanic crust; very steep Continental Rise: (Where trenches do not exist) the steep slope merges into a more gradual incline

Ocean Basin Made of oceanic crust. It’s the area beyond the continental rise. 3 features of the Ocean Basin: Mid-Ocean Ridges: found near the center of most ocean basins; underwater mountains that have developed on newly formed ocean crust

Ocean Basin: 2. Abyssal Plains: deep, extremely flat features; thick accumulation of fine sediment

Ocean Basin: 3. Trenches: form at sites of plate convergence where one moving plate descends beneath another and plunges back into the mantle.

Mt. Everest would be 2187 meters underwater. 7173 feet 1.36 miles