This is an irregular verb and the conjugations need to be memorized. A short lesson explains how. Mentir - French Verb Conjugations Learn how to conjugate mentir, an irregular -ir French verb. This is not an easy verb to conjugate, so you will need a good lesson to show you how.
Metamorphism occurs because some minerals are stable only under certain conditions of pressure and temperature. When pressure and temperature change, chemical reactions occur to cause the minerals in the rock to change to an assemblage that is stable at the new pressure and temperature conditions.
When preexisting rocks are exposed to conditions of high temperature and/or pressure they undergo solid-state changes (they metamorphose) to become metamorphic rocks. The rock doesn't melt, but it changes state by one or both of these processes: 1  mineral changes - growth of new minerals that are more stable under conditions of high temperature/pressure.  textural changes - recrystallization, alignment of platy minerals, usually as a result of unequal application of stress.