Volcanoes and Other Igneous Activity

Volcanoes and Other Igneous Activity
Multiple Choice

Name ______

1. Intraplate volcanism may be associated with the formation of ______over rising plumes of hot mantle material.

A)dikes

B)volcanic necks

C)ocean ridges

D)subduction zones

E)hot spots

2. These features are thought to originate at great depth and are the source of some intraplate basaltic magma.

A)mantle plumes

B)dikes

C)cinder cones

D)subduction vents

E)lapilli

3. Underground igneous rock bodies are called ______.

A)plutons

B)placers

C)playas

D)aquifers

E)pluvials

4. Pulverized rock, lava, and glass fragments produced from the vent of a volcano are known as ______.

A)pyroclastic material

B)craters

C)sills

D)nuée ardentes

5. Unusually large volcanic summit depressions that exceed one kilometer in diameter are known as ______.

A)calderas

B)vents

C)sills

D)craters

E)laccoliths

6. A ______is a tabular, concordant pluton.

A)laccolith

B)batholith

C)sill

D)stock

E)dike

7. Basaltic lava tends to be ______fluid than rhyolitic (granitic) lava.

A)less

B)more

8. Highly viscous magmas tend to impede the upward migration of expanding gases, which often results in ______eruptions.

A)relatively quiet

B)very slow

C)false

D)reverse

E)explosive

9. The most violent type of volcanic activity is associated with ______.

A)shield cones

B)sills

C)cinder cones

D)intermediate cones

E)composite cones

10. Which one of the following is NOT a factor that determines the violence of a volcanic eruption?

A)amount of dissolved gases in the magma

B)temperature of the magma

C)the magma's composition

D)size of the volcanic cone

11. The most abundant gas produced during Hawaiian eruptions is ______.

A)chlorine

B)water vapor

C)nitrogen

D)oxygen

E)carbon dioxide

12. The area of igneous activity commonly called the Ring of Fire surrounds the ______.

A)Pacific Ocean

B)Coral Sea

C)Sea of Japan

D)Atlantic Ocean

E)Indian Ocean

13. A magma's viscosity is directly related to its ______.

A)silica content

B)volcanic cone

C)color

D)age

E)depth

14. Eruptions of fluid basaltic lavas, such as those that occur in Hawaii, tend to be _____.

A)relatively quiet

B)explosive

C)extremely violent

D)unpredictable

E)none of the above

15. In general, an increase in the confining pressure ______a rock's melting temperature.

A)stabilizes

B)increases

C)decreases