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Volcanoes Section 2
Test Description: Practice questions for Volcanoes Section 2
Instructions: Answer all questions to get your test result.
1) The viscosity of magma depends upon its silica content and its
A
pyroclastic flow
B
magnetism
C
temperature
D
pahoehoe
2) Pahoehoe is
A
lava witha rough, chunky surface
B
volcanic ash
C
cooler, slow moving lava
D
fast-moving, hot lava
3) The major ingredient of magma is
A
obsidian
B
dissolved gases
C
silica
D
pahoehoe
4) Several kilometers from a volcano, a geologist observes an old lava flow made up of dark-colored basalt rock. The geologist can infer that the lava must have had
A
medium viscosity
B
low viscosity
C
high silica content
D
high viscosity
5) Which of the following helps to determine how easily magma flows?
A
the size of the crater
B
the amount of silica in the magma
C
the number of vents on the volcano
D
the diameter of the pipe
6) Viscosity increases as temperature
A
stays the same
B
increases and decreases
C
increases
D
decrease
7) The greater the viscosity of a liquid, the ___________ it flows.
A
faster
B
farther
C
deeper
D
slower
8) The resistance of a liquid to flowing is called _______.
A
aa
B
pressure
C
viscosity
D
silica
9) A quiet eruption may produce slow moving, cooler lava that hardens to form rough chunks called
A
pahoehoe
B
cinders
C
aa
D
ash
10) Magma flows easily when it is low in _________________.
A
silica
B
ash
C
aa
D
pahoehoe
*select an answer for all questions
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