Volcanoes and Plate Tectonics
Volcanic Eruptions
Volcanic Landforms
California Geology
Miscellaneous
100
Volcanoes are mostly located along plate boundaries.
Where are most volcanoes located?
100
The two types of volcanic eruptions are quiet and explosive.
What are the two types of volcanic eruptions?
100
The three types of volcanoes are the shield volcano, cinder cone volcano, and the composite volcano.
What are the three types of volcanes?
100
It took millions of years to shape California's major geological features.
How long did it take to shape California's major geological features?
100
One batholith in California is the Sierra Nevada batholith.
Name one batholith in California.
200
One example is Hawaii. Another example is Yellowstone National Park.
Give two examples of hot spots.
200
When a volcano erupts, the force of expanding gases pushes magma from the magma chamber through the pipe until it flows r explodes out of the vent.
What happens when a volcano erupts?
200
Lava and ash create landforms such as shield volcanoes, composite volcanoes, cinder cone volcanoes, and lava plateaus.
What landforms do lava and ash create?
200
Plate motions provide the force that pushes up California's mountains.
What provides the force to push up California's mountains?
200
Plate motions pushed up the Transverse Ranges into California.
What pushed up the Transverse Ranges into California?
300
A volcano forms above a hot spot hen magma erupts through the crust and reaches the surface.
How do hot spot volcanoes form?
300
Geologists often use the terms active, dormant, and extinct to describe a volcano's stage of activity.
What are a volcanos's stages of activity?
300
Features formed by magma include volcanic necks, dikes, sills, and batholiths.
How does magma that hardens beneath the surface create landforms?
300
A basin is a broad, bowl-shaped valley.
What is a basin?
300
A caldera is a huge hole left by the collapse of a volcanic mountain.
What is a caldera?
400
About 90 percent of the world's volcanoes are located in the Ring of Fire.
Where are most volcanoes located(a specific area) and how many?
400
Geologists classify whether an explosion is either quiet or explosive based on the silica content in the magma. Silica is composed of the elements oxygen and silicon.
How do geologists know if an explosion is either quiet or explosive? Name the substance and its composition.
400
An igneous rock layer that forms when magma hardens beneath the surface.
What is an intrusion?
400
The Central Valley formed when rocks uplifted on either side of it.
How did the Central Valley form?
400
Mount Shasta formed as a result of the subduction of the Juan de Fuca plate.
How did Mount Shasta form?
500
The Andes mountains.
In what mountains have volcanoes formed when an oceanic plate was being subducted under a continental plate in South America?
500
Two types of magma are Pahoehoe and Aa. When Pahoehoe hardens into rock, it looks like a solid mass of wrinkles and rope-like coils. When Aa hardens, it forms a rough surface consisting of jagged lava chunks.
What are two types of magma that can form from quiet explosions? Describe the rock that is formed when both types of lava harden.
500
A batholith is a mass of rock formed when a large body of magma cools inside the crust.
What is a batholith?
500
The movements of the Pacific and North American plates produced California's major geological features hese features include faults, volcanoes, mountain ranges, and basins.
How does plate tectonics help to explain features of California's geology?
500
One instrument that geologists use to detect changes in and around a volcano is a tiltmeter.
What is one instrument that geologists use to detect changes in and around a volcano?
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