Lab 2-ANS - Lab 2 ANSWERS Rock Cycle Igneous Metamorphic...

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Lab 2 - ANSWERS Rock Cycle – Igneous, Metamorphic, and Sedimentary Rocks 1. Fill out the rock analysis chart using these rocks. Rock List: ___Granite ___Slate ___Sandstone ___Diorite ___Schist ___Shale ___Andesite ___Gneiss ___Limestone ___Gabbro 2. What is the definition of a rock? A rock is a naturally occurring complex aggregate of minerals 3. Name and describe the two habits of crystallization of igneous rocks. 1. Intrusive (or plutonic) igneous rock forms when magma solidifies at depth. 2. Extrusive (or volcanic rock forms when lava or ash solidify at the surface. 4. What does it mean when an igneous rock is described as “porphyritic”? A prophyritic rock has large crystals in a groundmass of finer crystals, therefore the large crystals formed first as the magma cooled slowly, then the magma cooled quickly resulting in the finer crystals 5. What controls the size of the crystals in a rock? The size of the crystals in igneous rock depend on how fast the liquid magma cooled.
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