Volcanoes Section 2: Question Preview (ID: 13385)

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The viscosity of magma depends upon its silica content and its
a) pahoehoe
b) temperature
c) magnetism
d) pyroclastic flow

Pahoehoe is
a) cooler, slow moving lava
b) fast-moving, hot lava
c) volcanic ash
d) lava witha rough, chunky surface

The major ingredient of magma is
a) pahoehoe
b) silica
c) dissolved gases
d) obsidian

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) high silica content
b) high viscosity
c) low viscosity
d) medium viscosity

Which of the following helps to determine how easily magma flows?
a) the amount of silica in the magma
b) the diameter of the pipe
c) the size of the crater
d) the number of vents on the volcano

Viscosity increases as temperature
a) increases
b) decrease
c) stays the same
d) increases and decreases

The greater the viscosity of a liquid, the ___________ it flows.
a) slower
b) faster
c) deeper
d) farther

The resistance of a liquid to flowing is called _______.
a) aa
b) pressure
c) silica
d) viscosity

A quiet eruption may produce slow moving, cooler lava that hardens to form rough chunks called
a) pahoehoe
b) cinders
c) aa
d) ash

Magma flows easily when it is low in _________________.
a) silica
b) aa
c) pahoehoe
d) ash

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