RLAF+5.2


 * extrusive Rock-** igneous rock formed from lava that erupted onto Earth's surface
 * intrusive rock-** igneous rock that formed when magma hardened beneath Earth's suface
 * porphyritic texture-** a rock with larger crystals scattered on a background of much smaller crystals

Outline

 * Characteristics of Igneous Rock**
 * igneous rock is either formed from lava or magma
 * most igneous rocks are made from mineral crystals
 * you can tell if there's an igneous rock from its origin, texture, and mineral composition
 * Origin**
 * extrusive and intrusive rocks are the two types of igneous rocks
 * basalt is the most common extrusive rock
 * granite is the most common intrusive rock

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