Chapter 7 Volcanoes

Name ________________________________________ Date ______________________ Hour ________
Chapter 7 Volcanoes – Pretest
____ 1.
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Volcanic belts form along ___.
a. islands in the Pacific Ocean b. North American mountain ranges
plates
d. the coast of Antarctica
c. the boundaries of Earth’s
____ 2.
The formation of the Hawaiian islands is one example of ___.
a. volcanoes forming over a hot spot
b. volcanoes forming along plate boundaries
c. the Ring of fire
d. continental drift
____ 3.
The viscosity of magma depends upon its silica content and its ___.
a. pahoehoe
b. temperature
c. magnetism
d. pyroclastic flow
____ 4.
If a volcanoes magma is high in silica, the volcano will probably ___.
a. erupt quietly b. remain dormant
c. erupt explosively
d. produce dark colored lava
____ 5.
Pahoehoe is ___.
a. cooler, slower moving lava
rough, chunky surface
b. fast-moving, hot lava c. volcanic ash d.
____ 6.
When ground water heated by magma and collects in a natural pool, it is called a ___.
a. hot spring
b. geyser
c. vent
d. pyroclasic flow
____ 7.
The main hazard (threat) from a quiet volcanic eruption is ___.
a. volcanic gases
b. lava flows
c. geysers
lava with a
d. pyroclastic flows
____ 8.
Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called _.
a. shield volcanoes
b. cinder cone volcanoes
c. composite volcanoes d. lava plateaus
____ 9.
Which type of rock would you expect to form as the result of an explosive eruption?
a. pahoehoe
b. granite
c. pumice
d. aa
____ 10.
What is the landform that forms when a mass of hardened magma is uplifted, causing the layers of
rock to bend upward?
a. volcanic neck
b. dike
c. lava plateau
d. dome mountain
____ 11.
Before lava reaches the surface, the molten material is called ___.
a. rock
b. magma
c. volcanic ash
d. liquid fire
____ 12.
The volcanoes along converging oceanic plate boundaries may form ___.
a. a hot spot
b. a part of the mid-ocean ridge
c. an island arc
plate
d. a subducting
____ 13.
A mass of rock formed when a large body of magma cools inside the crust is called a ___.
a. neck
b. dike
c. lava plateau
d. batholiths
____ 14.
The huge hole left by the collapse of a volcanic mountain is called a ___.
a. lava plateau
b. caldera
c. cinder cone
d. shield volcano
____ 15.
Magma that squeezes between rock layers hardens into a ___.
a. sill
b. volcanic neck
c. dike
d. batholith
____ 16.
If geologists detect many small earthquakes in the area near a volcano, what can they infer about the
volcano?
a. It is dormant.
b. It is probably about to erupt. c. It is extinct.
d. It is a
good source of geothermal energy.
____ 17.
Several kilometers from a volcano, a geologist observes an old lava flow made up of dark-colored
basalt rock. The geologist infers that the lava must have had ___.
a. high silica content
b. high viscosity
c. low viscosity
d. medium viscosity
____ 18.
When ash, cinders, and bombs build up in a steep pile around a volcano’s vent, the result is a ___
volcano.
a. cinder cone
b. shield
c. composite
d. dormant
____ 19.
When magma hardens in a volcano’s pipe, the result will eventually be a landform called a ___.
a. batholith
b. dike
c. volcanic neck
d. sill
____ 20.
What provides the force that causes magma to erupt to the surface?
a. the silica in the magma
b. dissolved gases trapped in the magma
lithosphere
d. the density of magma
____ 21.
____ 22.
____ 23.
____ 24.
____ 25.
____ 26.
____ 27.
____ 28.
____ 29.
Which of the following helps to determine how easily magma flows?
a. amount of silica in the magma
b. the diameter of the pipe
the number of vents on the volcano
When temperature increases, viscosity ___.
a. increases
b. decreases
c. stays the same
Aa is ___.
a. fast moving, hot lava
high in viscosity
b. low in viscosity
c. gravity in the
c. the size of the crater d.
d. doesn’t change
c. smooth when hardened and cooled
d.
This volcano erupts quietly with low viscosity lava ___.
a. cinder cone volcano
b. composite volcano
c. active volcano
d. shield volcano
Which type of volcano only erupts explosively?
a. cinder cone volcano
b. composite volcano
c. active volcano
d. shield volcano
Lava that is high in silica will typically be ___.
a. called pahoehoe
b. light in color
e. a, b, and c
c. high in viscosity
A composite volcano erupts ___.
a. explosively
b. quietly
c. both a and b
In a quiet eruption ___.
a. gas pressure does not build much
b, and c
e. just b and c
b. silica and viscosity are low
f. none of these
In an explosive eruption ___.
a. viscosity and temperature are high
b. gas pressure is high
cinders, bombs come out in a pyroclastic flow e. b and d only
d. both b and c
d. none of these
c. temperature is high
c. silica is low d. ash,
f. a, b, c, and d
d. a,