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CH.13-17
SCIENCE
Term | Definition |
---|---|
The continental shelf | the area of seabed around a large landmass where the sea is relatively shallow compared with the open ocean. The continental shelf is geologically part of the continental crust. |
The continental slope | the slope between the outer edge of the continental shelf and the deep ocean floor |
The continental rise | is an underwater feature found between the continental slope and the abyssal plain. |
Abyssal plain | is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. |
Mid-ocean ridges | a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling |
Rift valley | a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems. |
Sea mounts | a submarine mountain. |
Ocean trenches | a long, narrow, deep depression in the ocean floor, typically one running parallel to a plate boundary and marking a subduction zone. |