Earth Science Geology, the Environment, and the Universe

Section 1: What are igneous rocks?

Multiple Choice Quiz

1
Peridotite and dunite have __________ compositions
A)felsic
B)mafic
C)ultramafic
D)intermediate
2
Which is not a compositional classification of a magma?
A)basaltic
B)rhyolitic
C)andesitic
D)phaneritic
3
What is the last mineral to form on the left branch of Bowen's reaction series?
A)pyroxene
B)feldspar
C)olivine
D)quartz
4
Granite is an example of __________ rock.
A)an extrusive igneous
B)a volcanic ash
C)an intrusive igneous
D)a partially melted
5
What process explains why a molten magma often is a mix of molten rock and crystals?
A)plate tectonics
B)melting points
C)partial melting
D)Bowen's reaction series
6
What branch of Bowen's reaction series cools with a continuous change in composition?
A)the iron-magnesium groups
B)the carbonates
C)the feldspars
D)the silica chains
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