Igneous Rock Lesson Notes PDF
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These notes cover the composition and texture of igneous rocks, including felsic and mafic types. It also differentiates between intrusive and extrusive igneous rocks. The notes discuss the factors affecting crystal size and the formation of volcanic glass.
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**Chapter Four: Rocks** **Lesson 2: Igneous Rock** Composition and Texture of Igneous Rock: 1. Felsic a. Lighter in color b. Less dense c. Rich in elements silicon, aluminum, sodium, and potassium 2. Mafic d. Darker in color e. More dense f. Rich in elements...
**Chapter Four: Rocks** **Lesson 2: Igneous Rock** Composition and Texture of Igneous Rock: 1. Felsic a. Lighter in color b. Less dense c. Rich in elements silicon, aluminum, sodium, and potassium 2. Mafic d. Darker in color e. More dense f. Rich in elements iron, magnesium, and calcium Longer it takes for magma to cool the more time mineral crystals have to grow the coarser the texture of the crystals in the rock **Intrusive:** when magma cools beneath the earth's surface - Has a coarse-grained texture - Longer for rock to cool - Large, well-defined crystals form - Felsic composition and texture **Extrusive:** igneous rock that erupts and cools and crystallizes on the earth's surface - very small crystals or no crystals at all - cools quickly on the surface - **Volcanic glass:** rock that forms when lava cools too quickly to form crystals - Mafic composition and texture
