Answer:
Oceanic crust is denser than continental crust. At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust. (Sometimes, oceanic crust may grow so old and that dense that it collapses and spontaneously forms a subduction zone, scientists think.)
Explanation:
Valence level (shell or cloud)
It is called Accommodation
This is because just like our fingerprints, no ones dna is exactly the same. We may have similarities with other people but they will never be exactly alike.