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How do the differences between continental and oceanic crust

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How do the differences between continental and oceanic crust affect the way plates interact?
The oceanic crust consists of heavier rock, mostly Basalt, so that if a oceanic plate collides with a continental plate the oceanic plate will be forced down below the continental plate, forming island arcs.
Continental plates are thicker than oceanic plates.
Mr. Gregory White, Professor
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Continental crust is less dense and thicker than the dense oceanic crust. When two oceanic plates collide, one of the plates is subducted and an island arc is formed. When an oceanic plate and a continental plate collide, the oceanic plate is subducted because it is denser than the continental plate. An example of this is along the Pacific Northwest where the Cascade volcanoes and mountains were formed by the subduction of the Juan de Fuca plate under the North American plate. When two continental plates collide, their densities are the same, so the plates fold and crumble up to form mountain ranges such as the Himalayas.
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Mr. Gregory White, Professor
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