Igneous Rocks

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The size of crystals in Igneous Rocks depends upon: pressure, the presence of air, the presence of water, cooling rate

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cooling rate

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Rocks that are formed from magma or lava are called

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igneous

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All rocks are classified based upon: the way they are formed, the elements they contain, the latitude and longitude where they are formed, the layers that are present

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the way they are formed

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The color of an Igneous rock tells about the rock's

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composition

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Igneous rocks are classified based upon their composition and

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texture

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Extrusive rocks are formed

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above the surface of a volcano

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Coarse-grained intrusive igneous rocks result when

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magma cools slowly

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Characteristics to identify an igneous rock as cooling on the surface.

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Vesicles (air bubbles) and very small or no crystals

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The most common INTRUSIVE igneous rock is

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granite

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Mafic rocks are

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dark in color due to their high iron and magnesium content