Question

What prevents continental crust from diving toward the mantle?

Answer 1

Subduction zone?

At ocean-ocean convergent plate boundaries, as the two plates with oceanic crust converge, one goes down beneath the other and into the mantle. This zone where a plate is diving back down into the mantle, beneath the edge of the adjacent plate, is called a subduction zone.

Answer 2

If I’m not mistaken I believe it’s density