Convergent boundaries are defined by?

• A. Two plates slide past each other.
• B. Two plates spread apart.
• C. Two plates collide.
• D. Subduction occurs.

Answer: (C)

Convergent boundaries are defined by the movement of tectonic plates toward each other, leading to collision. This collision is the key feature of these boundaries. Subduction, where one plate dives beneath another, is a common outcome at many convergent zones and helps explain trenches and volcanic activity, but it isn’t the defining action for every convergent setting (continental-continental collisions can produce mountains without subduction). The other options describe other boundary types: sliding past one another describes transform boundaries, and spreading apart describes divergent boundaries. So the essential idea is that convergent boundaries involve plates colliding.