Presentation on theme: "How a little bit of heat & pressure transform rocks!"— Presentation transcript:
1 How a little bit of heat & pressure transform rocks! Metamorphic RocksHow 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.Gneiss on topSlate on bottom
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 Other rocks are exposed to high heat & pressure To change form
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.Hornfels
8 Click on link and scroll down for nice pictures of metamorphic rocks.
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.FoliatedNonfoliated.
11 Foliated Non-Foliated Other rocks are exposed to high heat & pressure To change formOther rocks are exposed to high heat & pressureFoliatedNon-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.SlateGneiss
13 Flattened & pushed into parallel layers To change formOther rocks are exposed to high heat & pressureFoliatedNon-FoliatedFlattened & pushed into parallel layersslategneissPhyllite
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.QuartziteMarble
15 Flattened & pushed into parallel layers To change formOther rocks are exposed to high heat & pressureFoliatedNon-FoliatedlayersAnthracite coalFlattened & pushed into parallel layersQuartziteslategneissmarblephyllite