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Physical Science Exam
Chapter 8: Volcanoes
Multiple Choice
1. The most important volcanic belt, a narrow zone of active volcanoes that nearly
encircles the Pacific basin, is known as the ____.
a. Ring of Fire
b. Circum-Pacific belt
c. Pacific Archipelago
d. San Andreas belt
2. According to plate tectonics, earthquakes and volcanoes are far more likely to
occur at the edges of ___.
a. plates
b. tectonics
c. caldera
d. vent
3. The channel in a volcano through which gases, ash, and molten rock are ejected
from the earth’s interior is called the ___.
a. lava tunnel
b. magma
c. caldera
d. vent
4. A bowl shaped hollow more than 2 miles wide, formed by a collapse of an
underground magma chamber, is called a ____.
a. shield
b. caldera
c. reef
d. lagoon
5. An underground tunnel formed when the surface of a large lava flow hardens
before the lava beneath is called a ___.
a. caldera
b. magma chamber
c. vent
d. lava tunnel
6. Particles or blocks of solid ejecta are collectively referred to as ___.
a. calderas
b. pyroclasts
c. magma
d. pahoehoe
Matching: Words may be used more than once: Not all will be used!!!
7. highly explosive volcano
8. a reservoir of molten rock beneath the surface
9. the central channel which ejects ash, gases, and
rock
10. Example: mid-atlantic ridge
11. the thickness of the magma
12. when plates crash into each other
13. Example: the san andreas fault
14. includes water and carbon dioxide
15. an ejecta of lava
16. Includes particles or blocks of lava in the air
17. Volcano of loose material
18. Pour out lava in gentle eruptions
19. An example is Mauna Kea in Hawaii
20. An example is Mt. Saint Helens
21. Plate boundary when plates slide past each
other
22. Includes volcanic bombs
23. Most dangerous part of eruption with
superheated gases
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
p.
q.
composite volcano
shield volcano
cinder-cone volcano
divergent boundary
convergent boundary
transform boundary
gaseous ejecta
liquid ejecta
solid ejecta
caldera
vent
magma
lava
cone
crater
viscosity
fiery blast
Short Essay
24. What is the difference between an active volcano, a dormant volcano, and
an extinct volcano?
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25. What is a person called who studies volcanoes?
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26.
What two things often precedes a volcanic eruption?
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