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True or False Quiz
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Determine whether each of the statements below is true or false.

1
All igneous rocks form from magma.
A)TRUE
B)FALSE
2
All volcanic rocks are also igneous rocks.
A)TRUE
B)FALSE
3
All igneous rocks are composed of minerals.
A)TRUE
B)FALSE
4
Igneous rocks with aphanitic texture are also plutonic.
A)TRUE
B)FALSE
5
Igneous rocks that contain olivine solidified at relatively high temperatures.
A)TRUE
B)FALSE
6
Bowen's Reaction Series is a key to understanding igneous rocks.
A)TRUE
B)FALSE
7
Bowen's Discontinuous Series contains minerals with similar silicate structures but different chemical compositions.
A)TRUE
B)FALSE
8
The size of mineral grains in an igneous rock reveals information about the cooling history of the magma.
A)TRUE
B)FALSE
9
By definition, volcanic rocks are those extruded onto Earth's surface.
A)TRUE
B)FALSE
10
Pressure is an important variable controlling the formation of magma.
A)TRUE
B)FALSE
11
Temperature is an important variable controlling the formation of magma.
A)TRUE
B)FALSE
12
Olivine is the first mineral to form in Bowen's Continuous Series.
A)TRUE
B)FALSE
13
In Bowen's Discontinuous Series, more complex silicate structures form as temperature decreases.
A)TRUE
B)FALSE
14
All igneous rocks form from magma with the same composition.
A)TRUE
B)FALSE
15
Magma formation is common at divergent plate boundaries.
A)TRUE
B)FALSE
16
Deep inside Earth where temperatures are very high, all rocks have melted to form magma.
A)TRUE
B)FALSE
17
Andesite is a common igneous rock found in the Andes Mountains of South America.
A)TRUE
B)FALSE
18
Some magmas are cool enough for you to touch with your bare hand.
A)TRUE
B)FALSE
19
The most common igneous rock in the ocean basins is basalt.
A)TRUE
B)FALSE
20
All volcanoes in North America are extinct.
A)TRUE
B)FALSE





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