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What is a mantle plume,and what causes one to erupt?

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A mantle plume is a cylindrical plume of...

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Aphanitic,phaneritic,and porphyritic are textural terms that ____.


A) refer to fine-grained, course-grained, and mixed grained crystal sizes, respectively.
B) refer to formation by slow cooling, fast cooling, and mixed cooling rates, respectively.
C) are indicative of volcanic, plutonic, and mixed plutonic-volcanic origins, respectively.
D) are fine-grained, coarse grained, and mixed-grained crystal sizes respectively and are indicative of volcanic, plutonic and mixed plutonic-volcanic origins respectively
E) all of these

F) B) and C)
G) A) and E)

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What is a vesicular felsic rock called?


A) pumice
B) scoria
C) obsidian
D) tuff
E) volcanic breccia

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

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What phenomena does Bowen's Reaction Series help explain?

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Bowen's Reaction Series explains how fel...

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According to Bowen's reaction series,crystal settling should result in the magma being separated in lower layers rich in the early-formed ____________________ minerals,and upper layers enriched in later-formed ____________________ minerals.

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Although all compositions are represented,most plutons are ____.


A) felsic rocks
B) intermediate rocks
C) mafic rocks
D) felsic and mafic rocks
E) none of these

F) B) and C)
G) A) and D)

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Why does lava retain heat so well?

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because ro...

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How do the holes form in vesicular igneous rocks,such as scoria and pumice?

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They result from the entrapmen...

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The increase in Earth's temperature with depth is called the ____________________.

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Bowen's Reaction Series explains the order of mineral formation with decreasing temperature.

A) True
B) False

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Pegmatites are rocks of felsic composition that are similar to granite.

A) True
B) False

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How does lava differ from magma?

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Lava is ma...

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Basalt and gabbro are compositional equivalents,which means that they are made up of the same ____________________ but have different ____________________.

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Bowen's Reaction Series explains why Si-rich minerals are the last to crystallize from a magma.

A) True
B) False

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