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Exam 3: Igneous Rocks

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Question 81

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________ typically exhibit pyroclastic textures.

A) Granites
B) Gabbros
C) Diorites
D) Welded tuffs

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

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Question 82

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Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

A) gabbro
B) andesite
C) basalt
D) komatiite

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

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Question 83

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The aphanitic equivalent of diorite is

The most common ferromagnesian silicate minerals by % in igneous rocks are ________.

Basalt is the aphanitic or fine-grained equivalent of gabbro.

Which of the following igneous rocks is composed mainly of ferromagnesian minerals with less than 20% feldspar?

Which of the following is the dominant lava erupted from volcanoes in Hawaii and Iceland?

Olivine and quartz commonly crystallize together from mafic (basaltic)magmas.

Glassy pyroclastic deposits that fuse together as they fall are called ________.

The partial melting of a gabbro deep in the crust could generate a felsic (granitic)magma.

How much silica do ultramafic igneous rocks contain?

Which of the following high silica igneous rocks can be of low enough density to float on water?

How much water does it take to lower the melting point of basalt by 100 degrees?

What term denotes the larger mineral grains in a porphyritic igneous rock?

Which of the following best describes the composition and form of the typical felsic bedrock in the Coast Ranges of BC, highlands of Nova Scotia, or the Sierra Nevada Mountains in California?

Pegmatites consist of what size mineral grains?

The most abundant elements in common crustal igneous rocks are ________.

Earth's crust and mantle are composed predominantly of solid (not molten)igneous rocks.

As the silica content varies from less than 40% to more than 70% there is a systematic ________.

The average geothermal gradient in the upper crust is about 25° C/km.