Download Igneous Rocks Notes

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