Patterns in the distribution of volcanoes
Relationship between magma composition and type of volcano formed
Volcanic hazards associated with various kinds of flows
The effect of ash, lava, pyroclastic flows, and lahars on the environment and people
How to stay safe in the presence of an active volcano
100
A peaked or flat-topped underwater mountain rising from the ocean floor.
What is a seamount.
100
Molten rock that issues from a volcano or fissure.
What is lava.
100
An outpouring of molten lava from a vent of fissure.
What is lava flow.
100
Ash landing on buildings can cause this.
What is roof collapse.
100
Holding this over your mouth will help you breath.
What is a damp cloth.
200
A continuous mountain range extending through the North and South Atlantic, the Indian ocean, and the S. Pacific ocean.
What is the mid-ocean ridge.
200
Naturally occurring molten rock material generated within the Earth.
What is magma.
200
Affect the flow of lava.
What is slope and cooling.
200
When soaked by rain, loose ash can form these.
What is lahars.
200
Do this if you are outdoors when a volcano erupts.
What is go indoors.
300
The deep central cleft of the mid-ocean ridge.
What is rift valley.
300
A broad, gently sloping volcanic cone of flat-dome shape, usually tens of hundreds of square miles in extent.
What is shield volcano.
300
Flows of low-silica lava can travel this far from the source.
What is tens of kilometers.
300
At ground level, fine ash can cause this in humans and animals.
What is breathing problems.
300
At ground level, fine ash can cause this.
What is damage in automobile and truck engines.
400
Eruptions along the western edge of the U.S. have formed these.
What is the Cascades.
400
Rock or mineral that solidified from molten or partly molten material.
What is igneous rock.
400
Lahars can carry boulders this size.
What is more than 10 meters in diameter.
400
Volcanic bombs and lapili that fall on or near the volcano.
What is ballistic debris.
400
A disaster preparedness plan includes these.
What is a disaster survival kit and an emergency evacuation plan.
500
Example of a chain of islands formed by a hot spot.
What is Hawaii.
500
Material with the chemical composition SiO2.
What is silica.
500
Lava that is cooler and has higher silica content than basaltic lava, moves a few kilometers per hour, and rarely moves past the base of the volcano.
What is andesitic lava.
500
Within the last 15 years, this many commercial air crafts have been damaged as they flew through volcanic ash.
What is 80.
500
In homes within the 20-mile danger zone, install and maintain these.
What is smoke alarms and fire extinguishers.
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