Why is continental crust usually older than oceanic crust?

On balance, the age of the continental crust (of a continent) will be older than the oceanic crust because the continental crust is not being recycled (to the extent that the oceanic crust is recycled)! To understand this phenomena you have to first understand where the oceanic crust is formed and where it subducts.

Explanation:

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Continental crust rarely gets destroyed and recycled in the process of subduction. Oceanic crust gets colder and denser with age. It gets dense to the point that it sinks in the upper mantle. The continental crust is lighter than the oceanic crust. The continental crust doesn't subduct. 

so whats the answer

transformative rocks are the stones that emerge from the transformation of existing rock composes in a procedure called changeability, implies changing of structures. transformative rocks are shaped from alternate shakes that are changing a result of warmth or weight connected. one of this model is the earth developments that making rocks profoundly cover or crushed which will make the stones warmed and put under awesome weight. they are not softening but rather the minerals they are containing are changed synthetically that will shape transformative rocks. now and again different rocks are shaped when the others are near some liquid magma and getting warmed.