Ch. 4 Notes (ig. rocks) Flashcards by Meghan Knobbe

Q

What makes an intrusive ig. rocks?

A

Cooled magma in a magma chamber

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Q

What makes an extrusive ig. rock?

A

lava

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Q

What is an example of an ig. rock?

A

Mount Rushmore

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Q

Magma

A

comprised on liquids, solids, and gas compnents

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Q

generation of liquid in magma

A

melting

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Q

crystallization

A

formation of solid crystal

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Q

gaseous components

A

volatiles

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Q

felsic

A

feldspar and silica- minor iron and magnesium

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Q

Mafic

A

magnesium and iron

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Q

Fine- grained

A

aphanitic (not visible)

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Q

Phaneritic (visible)

A

coarse- grained

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Q

coarse and fine-grained

A

Porphyritic

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Q

Groundmass

A

the fine grained component of a porphyritic rock

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Q

phenocryst

A

large crystals

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Q

texture w/ spherical gas pockets

A

vesicular

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Q

Pumice

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A

ejected magma; cools quickly in the air

Q

glassy

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A

cools v rapidly

Q

Breccia

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A

angular fragments

Q

What are three ways to melt a rock?

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A

decrease in pressure(bring towards surface)
add water
temp. increase (rare)

Q

Example of a mafic volcano

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A

Hawaii

Q

example of a fasic volcano

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A

mt. st. helens

Q

changing magma composition through incorporation of surrounding rocks

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A

Assimilation

Q

along sed. bedding

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A

sills

Q

across. sed bedding

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A

Dikes

inflated sed. rocks make a shallow dome

Laccolith