Download Chapter 9 Review Test

Name: ______________________ Class: _________________ Date: _________
Chapter 9 Review Test
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1. Pillow lava
a. forms a brittle crust that would be painful to walk on.
b. has a glassy surface with rounded wrinkles.
c. usually oozes from a volcano.
d. forms when lava erupts under water.
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2. A shield volcano
a. is sometimes called a stratovolcano.
b. has a jagged surface.
c. has gently sloping sides.
d. forms when lava erupts underwater.
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3. A cinder cone volcano
a. has gently sloping sides.
b. is formed by explosive and nonexplosive eruptions.
c. erodes over thousands of years.
d. has steep slopes.
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4. A combination of explosive and nonexplosive eruptions will create a
a. shield volcano.
c. cinder cone volcano.
b. composite volcano.
d. plateau volcano.
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5. Which of the following best describes subduction?
a. movement of tectonic plates away from each other
b. movement of one tectonic plate against another
c. movement of one tectonic plate under another
d. side-by-side movement of two tectonic plates
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6. A dormant volcano
a. is currently explosive.
b. might erupt again.
c. usually erupts once each year.
d. has never erupted.
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7. Molten rock deep underground often gathers in a
a. vent.
c. landslide.
b. magma chamber.
d. caldera.
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8. Lava that is very runny probably
a. has a low silica content.
b. is hotter than most lava.
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c. has been cooled below the surface.
d. comes from explosive volcanoes.
9. Which type of lava flows most like dripping wax?
a. aa lava
c. blocky lava
b. pillow lava
d. pahoehoe lava
10. The three main types of volcanoes are
a. shield, pahoehoe, and vented.
b. cinder, cone, and composite.
c. cinder cone, lapilli, and caldera.
d. shield, composite, and cinder cone.
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ID: A
Name: ______________________
ID: A
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11. Rock begins to melt when
a. both pressure and temperature decrease.
b. both pressure and temperature increase.
c. temperature increases and pressure decreases.
d. temperature decreases and pressure increases.
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12. Most active volcanoes form
a. far from bodies of water.
b. where tectonic plates collide.
c. where tectonic plates separate.
d. where tectonic plates move back and forth.
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13. A tiltmeter is an instrument that measures
a. gas ratios in a volcano.
b. changes in a volcano’s slope.
c. the intensity of earthquakes.
d. the temperature inside a volcano.
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14. Volcanic activity is common along the Mid-Atlantic Ridge. This activity occurs at a
a. mantle plume.
c. divergent boundary.
b. subducted plane.
d. break in the continental crust.
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15. Which of these would you expect to see during a nonexplosive eruption?
a. giant fountains of lava and rock
c. a mountainside caving in
b. clouds of ash darkening the sky
d. huge lava flows
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16. What does a tiltmeter measure?
a. gases
b. changes in a volcano’s slope
c. the intensity of earthquakes
d. the temperature inside a volcano
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17. Which kind of volcanic eruption is most destructive?
a. atmospheric
c. pahoehoe
b. explosive
d. nonexplosive
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18. Magma forms in deep in the Earth’s crust and in the mantle where
a. temperature and pressure are low.
b. temperature is high and pressure is low.
c. temperature and pressure are high.
d. temperature is low and pressure is high.
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19. Only about 5% of volcanoes on land form
a. along divergent boundaries.
b. along convergent boundaries.
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c. in hot spots.
d. in the Ring of Fire.
20. When infrared images show that an area is getting hotter, what is probably happening there?
a. Magma is sinking deeper into the Earth’s crust.
b. Magma is rising in an active volcano.
c. Lava inside a caldera is being warmed by the sun.
d. Pyroclastic material is filling a magma chamber.
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Name: ______________________
ID: A
Completion
Complete each sentence or statement.
21. When a magma chamber empties, a(n) ____________________ results.
22. An opening in the Earth’s crust through which magma and gases are expelled is called a(n)
____________________.
Use the terms from the following list to complete the sentences below.
magma
blocky lava
landforms
lapilli
23. Pebble-like bits of magma that cool in the air are called ____________________.
24. Craters, calderas, and lava plateaus are volcanic ____________________.
Use the terms from the following list to complete the sentences below.
convergent boundary
subduction
hot spot
rift zone
25. An area where tectonic plates collide is a(n) ____________________.
26. One tectonic plate slides underneath another in a process called ____________________.
27. A set of deep cracks between tectonic plates is called a(n) ____________________.
Use the terms from the following list to complete the sentences below.
vent
magma chamber
lava
28. Volcanic material escapes the Earth through a ____________________ in active volcanoes.
Use the terms from the following list to complete the sentences below.
GPS
tiltmeter
satellite
magma chamber
29. Scientists often use a Global Positioning System, or ____________________, to detect changes in a
volcano’s shape.
30. Changes in temperature, slope, or earthquake activity indicate changes in a volcano’s
____________________.
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Name: ______________________
ID: A
Matching
Match each item with the correct statement below.
a. volcano
d. vent
b. lava
e. ash
c. magma
f. pyroclastic material
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31.
32.
33.
34.
35.
36.
molten rock underground
magma that flows on the Earth’s surface
dust-sized particles of hardened lava
magma that is blasted into the air and hardens
vent on Earth’s surface through which magma and gases are expelled
a crack or opening in the Earth’s crust
Match each item with the correct statement below.
a. crater
c. lava plateau
b. caldera
d. rifts
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37.
38.
39.
40.
long cracks in the Earth’s crust
a funnel-shaped pit near a volcano’s central vent
a large, semicircular depression over a magma chamber
a wide, flat landform; usually covers a large area
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