Chapter3B - T&L-3-1 Rocks Chapter 3 Rocks Rock...

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Unformatted text preview: T&L-3-1 Rocks Chapter 3 Rocks Rock A solid piece of mineral substance, usually a mixture. Mineral Example Granite is composed of the minerals quarty, mica, hornblend and orthoclase (a feldspar). Light Color = Light Weight Dark Color = Heavy Weight T&L-3-2 Rocks Rock Types Based on History Igneous Rock Results from the crystallization of magma (granite, basalt). magma molten rock. Sedimentary Rock Forms from the lithification of sediment (sandstone, limestone). Sediment Fragments of rock, plant or animal material, dissolved chemicals. Lithification Hardening by compaction or cementation. Metamorphic Rock Forms by the metamorphosis of other rocks. Metamorphism A gradual change due to heat, pressure or the penetration of active uids taking place far below the surface. Weathering The breakdown of rock due to effects taking place near to the surface. T&L-3-3 Rocks The Rock Cycle S edi men t S e d i m e n t a r y R o c k I g n e o u s R o c k M e t a m o r p h i c R o c k S e d i m e n t a r y R o c k Uplift Weathering Deposition and Lithification Cementation and Compaction Deposition and Lithification Cementation and Compaction Deep Burial Melting and Crystallization Deep Burial Metamorphism Metamorphism Melting and Crystallization More T&L-3-4 Rocks Properties of Rocks Texture: Size and/or arrangement of grains or crystals in a rock, existence of gas bubbles. Texture is a sign of the conditions at crystallization. Pictures Coarse-grained Grains large enough to be obvious (granite). Fine-grained Smaller grains (not visible to naked eye) (volcanic rock). Glassy (Amorphous) Grains not visible with a microscope....
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This note was uploaded on 01/06/2009 for the course PSC 103 taught by Professor Nichols during the Fall '08 term at Point Loma.

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Chapter3B - T&L-3-1 Rocks Chapter 3 Rocks Rock...

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