GENERAL GEOLOGY

Detailed explanation-1: -Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

Detailed explanation-2: -Sedimentary rocks like bituminous coal, limestone, and sandstone, given enough heat and pressure, can turn into nonfoliated metamorphic rocks like anthracite coal, marble, and quartzite. Nonfoliated rocks can also form by metamorphism, which happens when magma comes in contact with the surrounding rock.

Detailed explanation-3: -Sedimentary rock may be broken down into sediment once again by weathering and erosion. It may also form another type of rock. If it becomes buried deep enough within the crust to be subjected to increased temperature and pressure, it may change into metamorphic rock.

Detailed explanation-4: -Sedimentary rock that is exposed to heat and pressure becomes a metamorphic rock. Slate is an example of a metamorphic rock. It forms from a sedimentary rock called shale. Another example is marble, which forms from limestone.

Detailed explanation-5: -Sedimentary rock can become a metamorphic rock when exposed to higher levels of heat and pressure over time. These forces cause the minerals in the sedimentary rock to shift and realign into a different crystalline structure.