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12 Cards in this Set

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Igneous Rocks
any rock that crystalizes from out of a molten rock
Magma
Molten rock below ground
Lava
Molten rock at the surface
Mafic
Molten rock high in metals such as Fe and Mg and low in Si
Felsic
Molten rock high in Si and low in metals
A a
angular, sharp jagged, lava flows slow moving
Pahoehoe
smooth, ropy, fluid lava flows fast moving
Intrusive
igneous rocks that cool underground... Typically fast moving
Extrusive
igneous rocks that cool at the surface... typically slow
Porphory
an igneous rock that exhibits 2 cooling rates
Phenocryst
large crystals found in porphory
xenolith
a piece of "country rock" included within an igneous rock