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