During metamorphic processes, increased pressure and temperature can affect the of minerals in rock. rocks subjected to very high pressure are typically than others because mineral grains are squeezed together, and the atoms are more closely packed. during metamorphic processes, water facilitates the transfer of ions between and within minerals, which can the rate at which metamorphic reactions take place. the growth of new minerals within a rock during metamorphism has been estimated to be about per million years. metamorphism is commonly associated with convergent plate boundaries, where two plates move toward each other. during contact metamorphism, a large intrusion will contain thermal energy and will cool much more slowly than a small one. metamorphosed sandstone is known as the metamorphic rock made from metamorphosed shale, was once used to make blackboards for classrooms

stability denser increase 1 millimeter regional more quartzite slate

Explanation:

As the rocks under the metamorphic presses can cease their temperature and as a result  of which there stability of minerals in rocks gets affected, which leads rocks to get forced to a very high pressure and they form denser than other rocks and as the minerals grains are tightly packed they buckle up together. During this process, water can mix up with the minerals contents and increases the rate of metamorphic reaction. Thereby the growth of the minerals n the ricks forms up to one mm per million years. As regional metamorphism is associated with the convergent plates and during this process a large intrusion will contain more thermal energy a will cool more slowly than a small part. The metamorphosed sandstone is thus called as the Quartzite and slate is the metamorphic ricks that are made of shale and are used to make the blackboards.

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