“Volcanic Eruptions” Questions
Name_______________________________________
Date__________________
Directions: Read pg. 156-161. Answer the following questions in regards to the
readings. Good luck!
Volcanic Eruptions
_____ 1. A volcanic eruption can be _______________________ times stronger than the explosion
produced by the first atomic bomb.
a. 20
_____
b. 100
d. 10,000
2. Magma, which flows to the Earth’s surface, is known as which below?
a. molten rock
_____
c. 500
b. lava
c. pumice
d. ash
3. Which of the following can happen during non-explosive eruptions?
a. Violent eruptions can occur.
b. Tons of rock can be blasted into the air.
c. Huge amounts of lava can be released.
d. Fire and ash can shoot into the air.
_____ 4. Which of the following would you expect to see during an explosive volcanic
eruption?
a. calm lava flows
c. a rainbow
b. hot debris, ash and gas shooting into the air
d. lava fountains
_____
a. vent
5. An opening in the Earth’s surface through which volcanic material passes is a(n)
b. magma chamber
c. lava chamber
d. ash chamber
_____
6. More explosive volcanoes can occur when
a. there is a high level of water content, but a low level of silica content.
b. there is a low level of water content, and a low level of silica content.
c. there is a low level of water content, but a high level of silica content.
d. there is a high level of water content, and a high level of silica content.
_____ 7. Silica-rich magma has a stiff consistency. Therefore it will sometimes do which of
the following?
a. Harden and plug up a volcanoes vent system.
b. Prevent water vapor and other gases from easily escaping.
c. Cause gas bubbles to expand until they explode.
d. All of the Above