igneous, rock that forms from magma or lava that solidifies, extrustive, igneous rock that forms from lava exposed at the surface, intrusive, igneous rock that forms from magma underground, coarse-grained, plutonic igneous rock with large, visible crystals, fine-grained, volcanic igneous rock with small crystals (need magnification), glassy, type of igneous rock where grains are fused together, obsidian, a type of volcanic glass, vesicular, describes the spaces in igneous rocks like scoria formed from gas bubbles, mafic, dark-colored, igneous rock, usually containing iron or magnesium, felsic, light-colored igneous rock, usually containing, aluminum, potassium and sodium, granite, light-colored plutonic rock found in continental crust, continental crust, less-dense crust that averages 100 km thickness, oceanic crust, more-dense crust that averages 5 km thickness, sedimentary rock, forms from pre-existing rock or remains of living organisms, clastic, type of sedimentary rock with pieces cemented together, chemical sedimentary rock, rock that forms when solutions crystallize, organic sedimentary rock, type of rock that forms from once-living organisms, fossil, the remains of a once-living organism, weathering, breaking existing rock into smaller pieces, erosion, agents such as wind, water or gravity move pieces of rock, deposition, agents leave pieces of rock in a new location, compaction, pieces of rock move closer together because of rock on top, cementation, process of using carbonates or silica to hold pieces of rock together, metamorphic rock, chemical or structural change in rock due to heat and pressure, foliated rock, metamorphic rock that has mineral in bands or clumps, non-foliated rock, metamorphic rock that has minerals randomly throughout, regional metamorphism, plate movement applies necessary heat and pressure to a large area of rock, contact metamorphism, the heat from magma alters nearby rock, parent rock, the original igneous, sedimentary or metamorphic rock that undergoes metamorphism, rock cycle, a series of processes that change one type of rock into another

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