Most tectonic plates have both oceanic and continental crust. how is oceanic crust different from continental crust

Tectonic plates are results of volcanic lava produces by an active volcanoes and the cause of its eruption is the activity of the earths movement in the mantle. So the different of the two is the oceanic crust is usually form in the ocean, this plates or crust are mostly younger that the continental crust and could be recycle, while the continental crust is usually old in age and contains land organism living and rich of mineral have been found