The area between bulges of water in the ocean is called troughs.
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At some convergent boundaries, an oceanic plate collides with a continental plate. Oceanic crust tends to be denser and thinner than continental crust, so the denser oceanic crust gets bent and pulled under, or subducted, beneath the lighter and thicker continental crust. This forms what is called a subduction zone.
Continents and islands are examples of large landforms called LANDMASSES.<span>
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