It's a Volcano!
Hot
Lava!
Under Pressure
That's Runny!
Shh, be Quiet!
100
What is a volcano?
A weak spot in the crust where magma is able to escape.
100
What is a volcano that is not currently erupting, but may “awaken” and erupt in the future
Dormant
100
What is a lava plateau?
When many layers of thin, runny lava build up an elevated, area of flat land.
100
Where do volcanoes usually form?
Plate Boundaries
100
What is molten material called when it reaches the surface of the crust?
Lava
200
Why do volcanoes form near subduction zones?
The scraping of the plates causes rocks to break apart, melt, become less dense, and rise up into the crust.
200
What does it mean if magma is low in silica?
Quiet Eruption; runny, thin lava
200
What is a volcanic neck and how is it formed?
When the magma is hardened in the volcano's pipe and the softer rock around it is worn away.
200
What does it mean if a volcano is extinct?
It is unlikely that it will erupt again
200
What is a volcano that is currently erupting or may erupt in the future?
Active
300
Explain the soil near a volcano and why it is like this?
Some of the richest and most fertile soil in the world, lots of nutrients, good for growing crops.
300
Explain shield volcanoes
gently sloping, gradually flowing, thin runny lava.
300
When do pyroclastic flows usually occur?
During Explosive Eruptions
300
The Hawaiian Islands are examples of what?
Volcanoes/Islands created by a hot spot
300
What are vents?
Places where magma forces it way out of the volcano.
400
Explain a cinder cone volcano
explosive eruptions, ash, cinder, and bombs, steep, thick/sticky lava.
400
How is a caldera formed?
After an enormous eruption, a volcano’s magma chamber partially empties, and it collapses inward.
400
What is Aa?
cooler, thicker, slower-moving lava.
400
What is the Ring of Fire and where is it located?
A major volcanic belt that circles the Pacific Ocean.
400
What are 2 signs of a possible eruption?
H.F./L.F. earthquakes, deformation, tremor
500
How do volcanoes produce earthquakes?
The magma rises and the pressure cracks rocks in the pipe.
500
What causes magma to rise the surface and erupt?
Dissolved gases trapped in the magma
500
What is the crust that is bent into a bowl-shaped valley called between the Sierra Nevada and Coastal Mountain Ranges in California called?
A Basin
500
What type of volcano was the Amboy Crater?
A Cinder Cone
500
How were Mount Shasta and Lassen Peak formed?
Subduction of the Juan de Fuca plate
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