Earth Science Geology, the Environment, and the Universe

Section 2: Eruptions

Self-Check Quizzes-English

1
Where is andesitic magma found?
A)on islands in the Pacific, such as Hawaii
B)at the margins of continents
C)in the middle of oceanic crust
D)inside of continental crust
2
When does magma form?
A)when volcanoes erupt
B)when temperatures are hot enough to melt rock
C)when grains have been compacted together
D)when new minerals form due to chemical changes in the rock
3
Rhyolitic magma has the highest viscosity of all magma. How is this related to its silica content, compared to the other magmas?
A)It has no silica.
B)It’s the same.
C)It’s the lowest.
D)It’s the highest.
4
Why does magma move up to and through Earth's crust?
A)It is less dense than surrounding rock.
B)It is cooler than the crust.
C)It is more dense than surrounding rock.
D)It is more viscous than ocean water.
5
Rock fragments thrown into the air during a volcanic eruption are called ___.
A)tephra
B)extrusive
C)granite
D)lava
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