Download Magma Composition at Volcanoes Quiz

Magma Composition at Volcanoes Quiz
1) Knowing the magma composition will determine
a) Eruption style
b) Type of volcanic cone that will form
c) Composition of rock found at the volcano
d) All of the above
2) ___________________ lava is low in silica, less viscous, and erupts effusively.
3) Felsic lava is more likely to stay deeper in the crust and cool slowly.
a) True
b) False
4) ___________________ is the thickness of a liquid or its resistance to flow.
5) This is a region below a volcano where magma and gases collect.
a) Magma chamber
b) Vent
c) Pipe
d) Crater
*6) If magma is high in silica and more viscous, what type of eruption will form?
a) Effusive
b) Explosive
c) Alternative
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d) Pahoehoe
7) What causes an eruption to take place?
a) The composition of the magma.
b) The location of the magma beneath the volcano.
c) The viscosity of the magma.
d) The amount of dissolved gases that become trapped by the magma.
8) Lava cools so quickly that there are never any visible mineral grains in it.
a) True
b) False
9) If you find a light colored ash, containing minerals such as quartz, you know that
this represents
a) A mafic magma that erupted effusively.
b) A felsic magma that erupted effusively.
c) A felsic magma that erupted explosively.
d) A mafic magma that erupted explosively.
10) Magma composition is determined by
a) The composition of the parent rock and the amount of partial melting it underwent.
b) The amount of fractional crystallization and the composition of the parent rock.
c) The viscosity of the parent rock and whether it undergoes partial melting or fractional
crystallization.
d) The plate tectonic setting of the volcano.
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