Igneous Rocks.

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Presentation transcript:

Igneous Rocks

What are they? Rock made from cooled LAVA or MAGMA.

Classification Igneous Rock is classified in 3 ways… Texture Origin (where it formed) Mineral Composition

Texture Coarse Grained = large grains, cooled slowly Fine Grained = small grains, cooled fast Porphyritic = small AND large grains (resembles jello w/fruit in it)

Course Grained Granite = Intrusive Igneous rock Fine Grained Basalt = Extrusive Igneous rock Porphyritic Texture Porphyritic Granite

Origin Intrusive – formed UNDERGROUND. It cools slowly so it will have large grains. Extrusive – formed ABOVE GROUND. It cools fast so it has small grains.

Mineral Composition How much silica is in the magma/lava? High silica content = light colored = Mafic Low silica content = dark colored = Felsic High Silica Content Low Silica Content Mafic Igneous Rock Felsic Igneous Rock

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