jcjc5.2

vocabulary

 * Extrusive rock**: igneous rock formed from lava that erupted onto earths surface.
 * Intrusive rock**: igneous rock that formed when magma hardened beneath earths surface.
 * Porphyritic texture:** A rock with a large crystal scattered on the backround of smaller crystals.

outline

 * charicteristics of igneous rock**


 * origin

texture


 * mineral compisition**


 * uses of igneous rocks