Collisions+Between+Continents

What happens when two continents collide to each other?
 * Both or one side of the continent will have always different size or sometimes the same size. The wedges on the continent have a soft material that will crumple first. As the continents collide into each other, a mountain forms.

What happens when two continents collides throughout the years?
 * When the two continents collide together throughout the years, the mountains that were formed are still growing taller throughout the years until they two continents stp colliding into each other.

What other possible consequence may also happen when two plates collide together?
 * When two plates collide together, the two plates will cause the formation of a new trench.