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Metamorphic Rocks How a little bit of heat & pressure transform rocks!

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Presentation on theme: "Metamorphic Rocks How a little bit of heat & pressure transform rocks!"— Presentation transcript:

1 Metamorphic Rocks How a little bit of heat & pressure transform rocks!

2 Metamorphic Rocks The term "metamorphic" means "to change form." The mineral composition of the rock must change for the rock to become metamorphic.

3 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.

4 2) What types of rocks can undergo metamorphism? Any rock (igneous, sedimentary, or metamorphic) can become a metamorphic rock.

5 To change form Other rocks are exposed to high heat & pressure

6 3) Where do rocks become metamorphic? Deep within the Earth.

7 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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9 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.

10 6) What are the two textures of metamorphic rock? Classified according to its composition and texture. –Foliated –Nonfoliated.

11 To change form Other rocks are exposed to high heat & pressure Foliated Non-Foliated

12 7) What are 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

13 To change form Other rocks are exposed to high heat & pressure Foliated Non-Foliated Flattened & pushed into parallel layers slate Phyllite gneiss

14 8) What are 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

15 To change form Other rocks are exposed to high heat & pressure Foliated Non-Foliated Flattened & pushed into parallel layers slate phyllite gneiss layers Quartzite marble Anthracite coal

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