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Igneous Rocks Noted 11/2/05 WHAT IS AN IGNEOUS ROCK? A rock formed as the result of _______________________________________. ________________- molten rock beneath the earth’s surface ________________- molten rock above the earth’s surface Most are ____________________, composed of more than one mineral IDENTIFICATION Based on __________________, or grain appearance (size of ______________). The longer the molten rock takes to cool and solidify, the _____________ the mineral crystals will grow. The faster the molten rock cools and solidifies, the ______________ the mineral crystals will be. TYPES _____________ (or volcanic) igneous rocks form from solidified lava on the earth’s surface -Cools quickly = small crystals (fine grain) _____________ (or plutonic) igneous rocks form from solidified magma within the earth -Cools slowly = big crystals (coarse grain) IGNEOUS ROCKS ARE EITHER: ____________- lots of plagioclase feldspar and pyroxene, very __________ in color ____________- lots of potassium feldspar and quartz, very __________ in color