Study Guide
__i_1. Geyser
a. The huge hole left by the collapse of a
volcanic mountain
b. A weak spot in the crust where
magma comes to the surface.
c. A substance that cannot be broken
down into other substances.
d. Lava that flows easily and hardens
into a rippled surface.
e. What magma is called when it reaches
the surface.
f. Volcanic belt surrounding the Pacific
Ocean that contains 75% of the world’s
volcanoes.
g. Lava that is cooler and slowermoving.
h. A substance made of two or more
elements that have been chemically
combined.
i. A fountain of water and steam that
erupts from the ground.
j. A molten mixture of rock-forming
substances, gases, and water from
the mantle.
__f _2. Ring of Fire
___j__3. Magma
__c__4. Element
__g__5. Aa
__a__6. Caldera
__b__7. Volcano
__e__8. Lava
__d_9. Pahoehoe
__h_10. Compound
11. Volcanoes can form along diverging plate boundaries on land. T F
12. Hot spots form only under oceanic crust. T F
13. Liquid magma rises until it reaches the surface, or until it becomes trapped beneath layers of rock. T
F
14. The pipe of a volcano is a horizontal crack in the crust. T F
15. The Hawaiian Islands are cinder cone volcanoes. T F
16. A composite volcano has both quiet and explosive eruptions. T F
17. Some types of volcanic activity do not involve the eruption of lava. T F
18. The greater the viscosity, the __________ a liquid flows. The _______________ the viscosity, the
more easily a liquid flows.
a. faster, lower
b. slower, lower
19. What factors determine the viscosity of magma?
c. faster, greater
d. slower, greater
a. silica content, temperature
b. silica content, pressure
c. temperature, pressure
d. viscosity, comound
20. What factors determine the force of a volcanic eruption?
a. silica content, temperature
b. viscosity, pressure
c. silica content, viscosity
d. viscosity, temperature
a. Pipe
b. crater
c. vent
d. magma