When two plates push against each other, the pressure makes the crust bend to form mountains.
<u>Explanation:</u>
When a tectonic plate moves towards the other, or two tectonic plates approach each other, there is a convergent action.
This action brings two usual possibilities based on the strength and density of the plates.
If the two plates are equally dense and are exerting equal pressure on each other, then there is an uplift action of landmasses on both the sides which causes the formation of a mountain.
If one of the plates is less dense, it undergoes subduction and moves below the heavier plate causing the other plate to rise to form a mountain.
