Aplate edge made of oceanic crust collides with another plate edge made of the same type of crust. what will happen ?

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Oceanic crust is denser than continental crust. At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust. ... If the same kind of crust collides, such as continent-continent, the plates may crash together without subducting and crumple together like crashing cars.

It allows water to resist freezing and thawing cycle.

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