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Exam 4: Igneous Rocks and Intrusive Activity

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Question 21

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Visible quartz and potassium feldspar grains are the main constituents in a _________.

A) granite
B) rhyolite
C) basalt
D) gabbro

E) A) and B)
F) C) and D)

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Question 22

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________is composed mainly of ferromagnesian minerals.

A) Rhyolite
B) Andesite
C) Granite
D) Peridotite

E) A) and D)
F) B) and C)

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Question 23

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In general, what happens in terms of composition as crystallization proceeds down the Bowen's reaction?

Pegmatites consist of what size mineral grains?

Which of the following igneous rocks has a pyroclastic texture?

Name two igneous rocks with glassy textures.

Which magma is most likely to quench (congeal) to a natural glass?

Melting of rocks to form magma as a result of decreases pressure is known as________.

________is a volcanic rock that is extremely vesicular and glassy.

________is thought to be common in the Earth's mantle but rare in the crust.

In which of the following igneous rocks and environments would you expect to find unusually high concentrations of rare elements such as lithium, beryllium, and boron?

A _________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.

Igneous rocks are classified on the basis of what two main characteristics?

Pyroxene, hornblende, and biotite are all minerals found on the________ series of Bowen's Reaction Series.

A(n) ________texture would be most unlikely to occur in an extrusive igneous rock.

________is named for a prominent, volcanic mountain range in western South America.

________refers to the removal and isolation of early- formed mineral grains that can cause the composition of the remaining magma to change.

The sizes, shapes, and arrangements of mineral grains in an igneous rock are known as _________.

________magma, commonly erupted along oceanic ridge systems, originates by partial melting of mantle peridotite.

________has the same mineral composition as andesite.