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Earth Sci Rocks and Minerals > Igneous Rocks > Flashcards

Igneous Rocks Flashcards

1
Q

How do we classify Rocks?

A

We classify rocks according to how its formed.

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2
Q

What is are Igneous Rocks?

A

An igneous rocks are rocks that form from the cooling and solidification of magma or lava.

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3
Q

Lava

A

Molten rock above surface

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4
Q

Magma

A

Molten rock under surface

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5
Q

How to classify Igneous Rocks?

A

Igneous Rocks are classified according to where they cooled and solidified.

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6
Q

These rocks are formed inside the earth from Magma

A

Intrusive Igneous Rocks

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7
Q

Intrusive Igneous Rocks are also called:

A

Plutonic Rocks

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8
Q

Because magma cools slowly in Intrusive Igneous Rocks:

A

Big Crystals Form

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9
Q

Any crystal larger than 1 milimeter =

A

Intrusive Rock

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10
Q

These rocks form above the surface from Lava

A

Extrusive Igneous Rocks

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11
Q

Because lava cools quickly in Extrusive Igneous Rocks:

A

Small or no Crystals Form

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12
Q

Extrusive Rocks are also called

A

Volcanic Rocks

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13
Q

Extrusive Rocks may be vesicular. What are vesicular rocks?

A

Vesicular Rocks are rocks with holes or cavities. (Ex. Pumice)

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14
Q

A type of igneous rock composition that is made mostly of light minerals such as quartz and feldspar.

A

Felsic (Light/ Low Density)

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15
Q

A type of igneous rock composition that is in between felsic and mafic.

A

Intermediate

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16
Q

A type of igneous rock composition that is made mostly of dense, dark minerals like olivine and pyroxene.

A

Mafic (High Density)

17
Q

A type of igneous rock rock that contains more than 90% mafic minerals and have very few light, felsic minerals in them.

A

Ultramafic (90% Mafic)

18
Q

Is Basalt considered Intrusive or Extrusive?

A

Basalt is an extrusive igneous rock common below the oceans, though it is also found in some places on continents.

19
Q

To harden after cooling.

A

Solidify

20
Q

What are the 4 mineral compositions of igneous rock?

A

Felsic, Intermediate, Mafic, Ultamafic

Earth Sci Rocks and Minerals (4 decks)

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