ANATOMY

Detailed explanation-1: -Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.

Detailed explanation-2: -When rocks are pushed deep enough down into the Earth, they can melt to form molten rock. Below the surface of the Earth, molten rock is called magma but when erupted above the ground, usually through volcanoes, it is called lava.

Detailed explanation-3: -Igneous and sedimentary rocks can change into metamorphic rocks under great heat and pressure. For example, clay changes to slate and limestone changes to marble. Lava is molten.

Detailed explanation-4: -A rock with this texture is called gneiss. Since gneisses form at the highest temperatures and pressures, some partial melting may occur.

Detailed explanation-5: -As depth increases, temperature and pressure increase too. At a certain depth, temperature and pressure are so high that it may affect the mineralogy, texture or chemical composition of rocks. Rocks undergo a process called metamorphism.