Question

The sedimentary layers of Earth increase in temperature with depth. The massive weight of these layers also causes an increase in pressure which increases the temperature even more. This cycle of heat and pressure transforming the existing rock is called the rock cycle, a system of constantly changing rock formation and melting that links sedimentary, igneous, and metamorphic rock. The hotter the temperature and pressure the greater the metamorphic changes. Depending on the conditions under which rock is changed, the rock gradient forms new metamorphic rock into high-grade or low-grade metamorphic rock

Answer 1

Answer:

The highest grade metamorphic rocks will be formed at high temperatures and high pressures.

Explanation:

Metamorphic rocks can be described as the type of rocks which are formed by a change in the form of the existing rocks. In other words, metamorphosis of igneous, sedimentary or existing metamorphic rocks leads to the production of metamorphic rocks. High temperature and pressure are required by the rocks to change its form and develop into metamorphic rocks. Temperatures usually more than 320 degree Celsius are required for high-grade metamorphism.