CSTC+5.2

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Vocabulary

 * Extrusive rock**: is igneous rock formed from lava that went into Earth's surface


 * Intrusive rock**: Igneous rock that formed when magma hardened beneath Earth's surface


 * Porphyritic Texture**: a rock with large crystals scattered on a background of much smaller crystals

Outline

 * Characteristics of Igneous Rock**
 * Origin
 * Texture
 * Mineral Composition


 * Uses of Igneous Rocks**
 * building material
 * construction
 * cleaning and polishing
 * perlite