Final answer:
Metamorphic rocks occur in regions of compressional deformation and make up the roots of tall mountains.
Step-by-step explanation:
The rocks that occur in regions of compressional deformation and make up the roots of tall mountains are metamorphic rocks. Metamorphic rocks form when any pre-existing rock is altered by heat and/or pressure. The intense pressure that occurs during tectonic plate collisions contributes to the formation of metamorphic rocks. Most of the world's metamorphic rocks are found in mountain belts or ancient mountain belts.