CJKN+5.2

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Vocabulary
Extrusive rock:Igneous rock that forms from lava on earth's surface. Intrusive rock:Igneous rock that forms when magma hardens beneath earth's surface. Porphyritic texture:An igneous rock texture in which large crystals are scattered on a background of much smaller crystals.

Outline

 * characteristics of igneous rocks
 * origin
 * texture
 * mineral composition
 * uses of igneous rocks
 * cleaning
 * soap