igneous rocks Flashcards

1
Q

Form from

A

Magma (molten rock) or lava

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2
Q

How does magma form

A

Solid rock in crust / upper mantle partially melts

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3
Q

Why does magma rise

A

Magma is less dense. Cools as it rises due to geothermal gradient

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4
Q

Volcanic rocks are

A

Mafic and extrusive

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5
Q

Hypabyssal rocks are

A

Intermediate and intrusive

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6
Q

Plutonic rocks are

A

Felsic and intrusive

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7
Q

Aphantic

A

Indistinguishable crystal

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8
Q

Vesicular

A

Bubbly cavities

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9
Q

Pyroclastic

A

Other minerals inside

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10
Q

Porphyritic and phaneritic

A

Viable crystals

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11
Q

Pegmatitic

A

Coarse grain, large interlocking crystals

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