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9 Cards in this Set
- Front
- Back
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Extrusive Igneous
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Rapid cooling at Earth's surface, also known as volcanic rocks
ex. basalt |
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Intrusive igneous
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forces itself into surrounding rock...country rock
ex. granite |
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How do igneous rocks differ from each other?
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By texture and by mineral and chemical makeup
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Mafic rocks
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the higher the temp the higher the mafic in the rock....
ex. gabbro |
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Ultramafic
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ex. peridotite
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Chemical elements change from felsic to mafic
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Silica, sodium, potassium, viscosity inc. the more the rock is felsic.
Calcium, magnesium, iron, melting temp. inc. as the more mafic the rock gets |
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Plutons
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large igneous rocks formed at depth in Earth's crust.
- largest is batholiths |
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How does magma make space for itself?
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1. Wedging open the overlying rock
2. Breaking off large blocks of rock 3. Melting surrounding rock |
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dikes
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cut across layers of bedding in country rock and are discordant.
-underneath the ground |
