6.1
6.2
6.3
6.4
Reading Checks
100
A weak spot in the crust where molten material, or magma, comes to the surface.
What is a volcano?
100
Bowl-shaped area that may form at the top of a volcano around the central vent.
What is a crater?
100
A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs.
What is a cinder-cone?
100
A broad, bowl-shaped valley.
What is a basin?
100
Where an oceanic plate is subducted beneath a continental plate.
How did the volcanoes in the Andes Mountains form?
200
When magma erupts through the crust and reaches the surface.
How do hot spot volcanoes form?
200
Geologists classify volcanic eruptions as quiet or explosive.
What are the two types of volcanic eruptions?
200
These include shield volcanoes, cinder cone volcanoes, composite volcanoes, and lava plateaus.
What landforms do lava and ash create?
200
The movements of the Pacific and North American plates produced California's major geological features. These features include faults, volcanoes, mountain ranges, and basins.
How does plate tectonics help to explain features of California's geology?
200
The pressure of the surface rounding rock on the magma decreases.
What happens to the pressure in magma as the magma rises toward the surface?
300
Located on the island of Sicily in the Mediterranean Sea.
Where is Mount Etna located at?
300
Located beneath the volcano.
Where is the magma chamber located at?
300
It is a caldera and is located in Oregon.
Where is the Crater Lake located at?
300
Located in California and is a huge basin with the Sierras and Coast Ranges.
Where is the Central Valley located at?
300
Among the richest soils in the world.
How are volcanic soils important?
400
One major volcanic belt is the "____ __ ____", formed by the many volcanoes that rim the Pacific Ocean.
What is the major volcanic belt?
400
A "____ ____" is the area covered by lava as it pours out of a vent.
What is covered by lava?
400
Mount Etna is "___ ______ ____" in Japan.
What is named, "the perfect cone"?
400
The "______ ______" began to form several million years ago as plate movements pushed up a batholith.
What began to form several million years ago?
400
A type of explosive eruption that hurls out a mixture of hot gases, ash, cinders, and bombs.
What is a pyroclastic flow?
500
There are about 600 active volcanoes on land.
About how many active volcanoes are there?
500
In Hawaii, there are many myths about Pele...
What is the goddess of volcanoes?
500
Composite Volcanoes are quiet eruptions alternate with explosive eruptions, forming layers of lava and ash.
What are Composite Volcanoes?
500
Plate movement caused the crust to stretch and crack, allowing magma to the surface.
Why are there volcanoes?
500
Features formed by magma include volcanic necks, dikes, sills, and batholiths.
How does magma that hardens beneath the surface create landforms?
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