Question

unit review - earth systems
convergent boundaries are closely linked to divergent boundaries. while new crust is continually formed through upwelling from the mantle at divergent boundaries, older crust is simultaneously melted and recycled at convergent boundaries.
which of these describes what happens at a continent - continent convergent boundary?
two less dense continental crusts crash into each other.
a continental crust sinks into the earths core.
two oceanic plates collide.

Explanation:

At continent - continent convergent boundaries, two continental plates (less dense) collide. There is no subduction into the Earth's core as it's too rigid, and oceanic plates are not involved in this type of boundary.

Answer:

A. Two less dense continental crusts crash into each other.