Section #: 18.1
Magma
Practice Test
1.
Rhyolitic magma has the __________ viscosity, the __________ gas content and the __________ silica content of any type of magma.
SC.D.1.4.2
a.
lowest, highest, highest
b.
lowest, lowest, lowest
c.
highest, lowest, lowest
d.
highest, highest, highest
2.
Why does magma move up to and through Earth's crust?
SC.D.1.4.2
a.
It is less dense than surrounding rock.
b.
It is more dense than surrounding rock.
c.
It is cooler than the crust.
d.
It is more viscous than ocean water.
Hint
3.
__________ is the internal resistance to flow of a liquid.
SC.D.1.4.2
a.
Gravity
b.
Specific gravity
c.
Viscosity
d.
Weight
Hint
4.
When does magma form?
SC.D.1.4.2
a.
when grains have been compacted together
b.
when volcanoes erupt
c.
when temperatures are hot enough to melt rock
d.
when new minerals form due to chemical changes in the rock
Hint
5.
What type of magma has the lowest silica content and is the least explosive?
SC.D.1.4.2
a.
andesitic magma
b.
basaltic magma
c.
granitic magma
d.
rhyolitic magma
Hint
6.
When magma reaches Earth's surface it is called __________.
SC.D.1.4.2
a.
rock
b.
lava
c.
intrusive
d.
a batholith
Hint
