1. Igneous and Metamorphic Rocks - Review
Mr. White
6th Grade Earth Science

2. Write a definition for igneous and metamorphic rocks.
Warm Up
Write a definition for igneous and metamorphic rocks.
11/29/2018
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3. Template copyright 2005 www.brainybetty.com
Igneous Rocks
Igneous rocks are made either underground (intrusive) or above ground (extrusive).
At the surface, lava hardens to form extrusive rocks with tiny (fine-grained) crystals or glassy (no crystal) textures.
Beneath the surface, magma hardens to form intrusive rocks with easily visible (coarse-grained) crystal texture.
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Igneous Rocks
Light colored rocks are felsic rocks because they are basically made up of feldspar and silicon.
Dark colored rocks are mafic rocks because they are made up of magnesium and ferrum
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Metamorphic Rocks
Formed by heat and pressure changing existing rocks.
Regional metamorphism affects a large area and results from plate tectonics.
Contact metamorphism affects rocks on a local scale, such as “baking” sedimentary rocks next to magma or lava.
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Metamorphic Rocks
Non-Foliated – mineral grains are not arranged in plains or bands.
Foliated - contain aligned grains of flat minerals.
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7. Time To Complete Our Notes
Take out your Rock and Mineral Notes packet!
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8. ALL ABOUT THE ROCK CYCLE!
On Tap for Tomorrow!
ALL ABOUT THE ROCK CYCLE!
11/29/2018
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