Oceanography Part Three
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abyssal plain
smooth, nearly flat region of the ocean floor
continental shelf
a gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent
continental slope
the ocean floor sloping more deeply
magma
hot liquid inside of a volcano
mid-ocean ridge
a continuous range of mountains that wind around the earth
plates
pieces of the earth's crust
sea-floor spreading
eruptions causing rocks to spread, creating an ocean floor
seamounts
underwater mountains
sonar
a system that uses sound waves to calculate the distance to an object
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