What is another name for Intrusive? Plutonic

What is another name for Extrusive? Volcanic

What is the E.O.F. of a very coarse rock? Intrusive

What is the E.O.F. of Pumice? Extrusive

What is the E.O.F if the rock is Vesicular? Extrusive

Which is the only rock on your charts with grain size 10 mm or larger Which is the only rock on your charts with grain size 10 mm or larger? Pegamatite

What is the grain size of obsidian? Noncrystalline

What is the grain size of Basalt? Less than 1 mm

Which coarse grained rock is felsic? Granite

What is the term for rock with two textures? Porphyry or Porphyritic

A Felsic rock has what two elements for its composition A Felsic rock has what two elements for its composition? Silicon and Aluminum

What two elements does a Mafic rock contain? Iron and magnesium

A dark colored rock generally has a what composition? Mafic

What is the composition of Andesite What is the composition of Andesite? Intermediate (50% felsic and 50% mafic)

Why is it unusual that Obsidian is black Why is it unusual that Obsidian is black? Most felsic rocks are light in color

What happens to temperature when you increase in depth? It increases

What is the term called when the temperature increases with depth What is the term called when the temperature increases with depth? Geothermal Gradient

What happens to pressure when you increase in depth? It increases

What happens to the melting point of a rock as the water content increases? It decreases

Aside from temperature, pressure, and water content, what is another factor that impacts how magma is formed? Its composition

What is the texture of obsidian? Glassy and nonvesicular

What is the texture of Gabbro? Coarse

What does vesicular mean? Gas pockets

Which rock will have very coarse texture? Pegamatite

How can a rock develop porphyry? It cools at two different rates

What three main minerals will granite have What three main minerals will granite have? Potassium Feldspar Quartz Plagioclase feldspar

What are the three main minerals in Obsidian What are the three main minerals in Obsidian? Potassium Feldspar Quartz Plagioclase feldspar

What are the main minerals in Andesite? Plagioclase Biotite Amphibole

Dunite is made of which mineral? Olivine

Which rocks have amphibole, biotite, pyroxene, plagioclase feldspar and olivine? Basaltic glass, Scoria, Vesicular basalt, basalt diabase and gabbro

What is the name of the series that shows the relationship between cooling magma and mineral formation? Bowen’s reaction series

How does a rock develop large crystals? Cooling slowly

When magma cools, it crystallizes in the reverse order of partial melting. What is the name of the process in which different minerals form at different temperatures? Fractional Crystallization

Term for when some minerals melt at low temperatures and others remain a solid Partial melting

What does ignis mean in Latin? Fire

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Granite Intrusive 1 mm to 10 mm Coarse Felsic

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Pegmatite Intrusive 10 mm or larger Very coarse Felsic

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Basalt extrusive Less than 1 mm Fine Mafic

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Andesite extrusive Less than 1 mm Fine Intermediate

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Pumice Extrusive Non-Crystalline Glassy/Vesicular Felsic

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Scoria Extrusive Non-Crystalline Glassy/Vesicular mafic

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Obsidian Extrusive Non-Crystalline Glassy Felsic

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Gabbro Intrusive 1 mm to 10 mm Coarse mafic

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Dunite Intrusive 1 mm to 10 mm Coarse mafic or ultramafic

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Peridotite Intrusive 1 mm to 10 mm Coarse mafic

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Rhyolite Extrusive Less than 1 mm fine Felsic