Question

what happens to a more dense plate when it collides with a less dense plate? it goes over the top of another plate it floats at the top of the molten material it breaks up into small pieces it sinks into the mantle

Explanation:

In plate - tectonics, when a more dense plate (usually an oceanic plate) collides with a less dense plate (usually a continental plate), due to the difference in density, the more dense plate undergoes subduction. Subduction is the process where the denser plate sinks into the mantle.

Answer:

it sinks into the mantle