Download What`s Down There?

What’s Down There?
The ocean floor has many
features.
Inventions to Explore the
Ocean Floor
1925 Sonar
1943 Scuba
1960 Submersibles
1978 Satellite
1985 RUM
2003 Deep Flight
Aviator
Divisions of the Ocean Floor
Shallow Water Features
Shoreline: boundary where the land and
ocean meet.
Continental margin: where the
underwater edge of a continent meets
the ocean.
Continental shelf: flat part of the
continental margin covered with ocean
water. Best fishing; large deposits of oil.
Shallow Water cont..
Continental slope: edge of the
continental margin where the ocean
floor plunges steeply. Marks the
boundary between the oceanic crust
and continental crust.
Continental rise: separates the
continental shelf from the ocean floor.
Features on the Ocean Floor
Open Ocean Features
Abyssal plain: large, flat areas on the
ocean floor. Larger in the Atlantic and
Indian Oceans.
Seamount: underwater volcanic
mountains with steep sides and a
narrow summit.
Guyot: flat-topped seamount.
Open Ocean Cont…
Mid Ocean Ridge: mountain range
located under the ocean. Formed where
magma flows to the surface.
Rift Valley: mark the center of the mid
ocean ridge-where new crust forms.
Trench: long, narrow crevices along the
edge of the ocean floor. Deepest parts
of the ocean.
All Together Now