05. igneous_06 - IGNEOUS ROCKS 1 Know what to call liquid...

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IGNEOUS ROCKS 1) Know what to call liquid hot rock underground versus on the surface. Underground – Magma Surface – Lava 2) Know what to call an igneous rock that cooled and crystallized underground and what to call one that formed on the surface and what their relative crystal sizes are. Underground: Cools slowly to form large crystals, called intrusive igneous rock or plutonic rock. Above Ground: Extrusive igneous rock, also called volcanic rock, cools quickly and has small crystals. 3) Know the five principal igneous rock textures and their definitions. 1. Glassy – No crystals 2. Aphanitic – Crystals too small to see 3. Phaneritic – Visible crystals 4. Pegmatitic – Crystals are larger than one inch across 5. Porphyritic – Large crystals surrounded by small crystals 4) Know the three types of magma and what about them makes them different from each other. Composition, dissolved gases, temperature, and viscosity are important in differing.
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