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* Magmatism creates new crust along continental margins and as island arcs such as with the subduction of the Juan de Fuca plate under the North American plate continues to add material to the crust in the Cascade Range. * Accretion of pieces of crust such as island arcs and sea mounts with existing large continents. As plate movements subduct plates, the subducted plates bring with it land masses that if sufficiently buoyant can collide and merge with the larger continent.

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