Igneous Rock
Terms
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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