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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