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8 Cards in this Set

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What is a system that uses sound waves to calculate the distance to an object?
sonar
What is the gently sloping, shallow area of the ocean floor that extends out from the edge of a continent?
continental shelf
What is formed when volcanic mountains break the surface of the ocean and lava cools?
volcanic island
What is a steep incline that extends beyond the continental shelf to the deep ocean floor?
continental slope
What is a deep, steep-sided canyon in the ocean floor? It is often where the denser oceanic plate subducts under the less dense continental plate.
trench
What is the smooth, nearly flat region of the ocean floor that is made of thick layers of sediment and sunken remains of dead organisms?
abyssal plain
What part of the ocean consists of many peaks along both sides of a central valley?
mid-ocean ridge
What do we call a mountain whose peak does not reach the surface of the ocean above?
seamount