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Published byAllan Copeland Modified over 8 years ago
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Metamorphic Rocks How a little bit of heat & pressure transform rocks!
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Metamorphic Rocks The term "metamorphic" means "to change form." The mineral composition of the rock must change for the rock to become metamorphic.
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1) What is a metamorphic rock? Rocks buried deep in the Earth at high temperatures and pressures form new minerals and textures all without melting.
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2) What types of rocks can undergo metamorphism? Any rock (igneous, sedimentary, or metamorphic) can become a metamorphic rock.
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3) Where do rocks become metamorphic? Deep within the Earth.
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4) What is contact metamorphism? When a rock comes in contact with a heat source, such as a magma pool. The hot magma changes a narrow section of the surrounding rock.
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5) What is regional metamorphism? Occurs in areas with higher heat and pressure. Larger areas are affected. Usually occurs as a result of the Earth’s plates colliding or moving.
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6) What are the two textures of metamorphic rock? Classified according to its composition and texture. 1.Foliated 2.Non-foliated.
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foliated foliated metamorphic rocks Minerals have been flattened and pushed down into parallel layers. The bands in foliated metamorphic rock look like pages in a book. Slate Gneiss
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non-foliated non-foliated metamorphic rocks Do not display layers. Massive structures with no obvious banding. Mineral grains grow and rearrange, but they don’t form layers. Quartzite Marble
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