lava - molten material on Earth's surface, magma - molten material underground, intrusive - type of igneous rock that forms underground, extrusive - type of igneous rock that forms on the surface, small crystals - expected in rocks with quick cooling time, large crystals - expected in rocks with slow cooling times, pressure - increases with depth due to weight of overlaying rock , temperature - increases with depth due to proximity to the core, partial melting - all minerals have their own melting point, fractional crystallization - minerals form from magma in reverse melting order, increased pressure - causes melting point to increase, increased water content - causes melting point to decrease, felsic - light colored, silica rich rocks, mafic - dark colored, low silica rocks, porphyritic - igneous rock texture with small and large crystals due to rapid change in cooling time, vesicular - igneous rock texture caused by thick lava not allowing gas bubbles to escape,

Igneous Rocks

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