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Metamorphic Rock"Meta" comes from the Greek word meaning change. "Morphosis" means form in Greek. So.....
Metamorphic RocksHeat and pressure deep within the Earth's surface can change any rock into metamorphic rock.
Heat and PressureCollisions between Earth's plates can push the rock down toward the heat of the mantle. Also pockets of magma rising through the crust can also provide heat to change a rock.
CLASSIFYING METAMORPHIC ROCKSGeologists classify metamorphic rocks by the arrangement of the grains that make up the rocks. There are two categories:
FOLIATED AND NONFOLIATED
DEFINITION OF FOLIATED ROCKSA foliated rock has grains that are arranged in parallel layers or bands. The rocks can be thin and flat and may split apart along the bands. Gneiss is an example.
NONFOLIATED METAMORPHIC ROCKSThis is an example of a nonfoliated metamorphic rock.
NONFOLIATED ROCKSNonfoliated rocks have grains that are arranged in a random pattern. These rocks do not split into layers. Marble is an example of a nonfoliated metamorphic rock.
Uses of Metamorphic RockMarble is a metamorphic rock. Marble has a fine, even grain and is relatively easy to cut into thin slabs.
MarbleMarble is used by architects and sculptors for many buildings and statues. The Taj Mahal is made of gleaming white marble.
SlateSlate is foliated and splits easily into flat pieces that can be used for many things.
SlateSlate is used for flooring, roofing, outdoor walkways, or chalkboards.