High tempature and pressure over time will cause what in rock layers

Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock. The word "metamorphic" comes from Greek and means "To Change Form"

it will break over time

Explanation:

due to high temperature and pressure rock layers over a period of time will start vibrating this will cause the rocks to erode over time