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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
magnetism
B
pyroclastic flow
C
pahoehoe
D
temperature
2) Pahoehoe is
A
fast-moving, hot lava
B
volcanic ash
C
lava witha rough, chunky surface
D
cooler, slow moving lava
3) The major ingredient of magma is
A
silica
B
obsidian
C
pahoehoe
D
dissolved gases
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
low viscosity
B
high silica content
C
medium viscosity
D
high viscosity
5) Which of the following helps to determine how easily magma flows?
A
the amount of silica in the magma
B
the number of vents on the volcano
C
the diameter of the pipe
D
the size of the crater
6) Viscosity increases as temperature
A
increases and decreases
B
increases
C
decrease
D
stays the same
7) The greater the viscosity of a liquid, the ___________ it flows.
A
farther
B
slower
C
faster
D
deeper
8) The resistance of a liquid to flowing is called _______.
A
viscosity
B
aa
C
pressure
D
silica
9) A quiet eruption may produce slow moving, cooler lava that hardens to form rough chunks called
A
cinders
B
aa
C
pahoehoe
D
ash
10) Magma flows easily when it is low in _________________.
A
aa
B
silica
C
pahoehoe
D
ash
*select an answer for all questions
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