Parts of a Volcano
Volcanic Eruptions Part 1
Stages of Volcanic Activity
Volcanic Eruptions Part 2
Volcanic Hazards & Monitoring Volcanoes
100
Pocket beneath a volcano where magma collects.
What is magma chamber?
100
Two terms geologists use to classify volcanic eruptions.
What are quiet and explosive?
100
True or False: The activity of a volcano may last from less than a decade to more than 10 million years.
What is true?
100
Fine, rocky particles as small as a speck of dust.
What is ash?
100
During this kind of eruption, lava flows from vents, setting fire to, and then burying, everything in its path.
What is a quiet eruption?
200
Area covered by lava as it pours out of a vent.
What is lava flow?
200
Two things that determine whether an eruption is quiet or explosive.
What are silica content and viscosity?
200
Three terms that geologists use to describe a volcano's stage of activity.
What are active, dormant, or extinct?
200
Larger pieces of lava, ranging from the size of a baseball to the size of a car.
What are bombs?
200
During this kind of eruption, a volcano can belch out hot clouds of deadly gases as well as ash, cinders and bombs.
What is an explosive volcano?
300
A long tube that connects the magma chamber to Earth's surface.
What is pipe?
300
Kind of volcanic eruption that occurs if magma is low in silica and has a low viscosity.
What is quiet?
300
A volcano that is expected to awaken in the near future.
What is dormant?
300
Pebble-sized particles.
What are cinders?
300
This volcanic hazard can bury entire towns, cause roofs to collapse if it becomes wet, and cause jet engines to stall.
What is volcanic ash?
400
Bowl-shaped area at the top of a volcano.
What is crater?
400
Kind of volcanic eruption that occurs when magma is high in silica and is high in viscosity
What is explosive?
400
A volcano that is erupting or has shown signs that it may erupt in the near future
What is active?
400
Mount St. Helens erupted in Washington State on May 18, 1980. It was this kind of eruption.
What is explosive?
400
True or False: Geologists have been more successful in predicting volcanic eruptions than in predicting earthquakes.
What is true?
500
The opening through which molten rock and gas leave the volcano.
What is vent?
500
Occurs when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs.
What is pyroclastic flow?
500
A volcano that is unlikely to erupt again.
What is extinct?
500
Islands that formed from quiet eruptions.
What are the Hawaiian Islands?
500
One instrument that geologists use to detect slight surface changes in elevation caused by magma moving underground.
What is a tiltmeter?
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