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The ocean crust dives below the continental crust due to a collision. This collision involves the two types of crust and since the oceanic crust is denser, it sinks to the bottom while the less dense continental crust rises to the top.

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Why does oceanic crust dive underneath continental crust?

This process is known as subduction and occurs at convergent plate boundaries because oceanic crust is denser than continental crust.


What is the term for continental convergence?

One theory states that upon convergence of continental plates one will dive below the other, or subduct. This process, however is physically impossible since oceanic crusts that are many miles thick cannot dive down below continental, granitic rock that is much more dense. If anything, the oceanic crust must move onto the top of the continental plates. A more reasonable theory that has emerged lately is that the earth grows and all tectonic plates are expanding and constantly moving away from each other.


How do the densities of oceanic crust and continental crust influence what happens when an oceanic plate coverages with a continental plate?

Oceanic crust is more dense than continental crust. All that water weight compresses the heck out of the material in the plate and also the oceanic crust contains larger percentages of denser elements such as magnesium and iron than the continental crust which also contributes to it's higher density. This sets the conditions for what happens. The more dense oceanic crust will "dive under" continental crust because it is more dense, and all because of the difference in densities.


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