Volcanoes and Their Types
Landforms from Magma and Volcanoes
Parts of a Volcano
Eruptions
California Geology
100
What is weak spot in Earth's crust where magma,(molten material) comes to the surface?
Volcano
100
What is the inward collapse of a volcano?
Caldera
100
Beneath a volcano, the magma collects in a pocket called a...
Magma chamber
100
The material which determines how explosive a volcanic eruption will be is...
Silica
100
How did the San Andreas fault form.
As plates slide past each other, they push and pull on the crust with an enormous force. This makes the crust break which forming faults.
200
A mountain where lava flows gradually builds a wide,gently sloping volcano called...
Shield volcano
200
What forms when magma hardens inside of a volcanoes pipe?
Volcanic neck
200
Magma travels from the magma chamber through a long tube called a...
pipe
200
Geologists classify volcanic eruptions into 2 groups. The groups are...
quiet and explosive
200
( True/False) All of the volcanoes on the west coast of North America form from colliding boundaries...
True
300
Pyroclastic material such as ash, cinder, and bombs build up around the vent in a steep, cone-shaped hill or a small mountain called a...
Cinder cone volcano
300
An intrusion forms when magma hardens underground to form igneous rock. True or false an intrusion is always younger that the rock around it...
true
300
Molten rock and gas leave through an opening at the top or side of the volcano which is called a...
Vent
300
What terms do geologists use to determine a volcano's stage in its life cycle?
Active,dormant,and extinct
300
How did the Sierra Nevada form?
The force of the plate motions pushed a batholith up, forming the mountains we know today.
400
Tall,cone-shaped mountains in which lava flows generally alternate with layers of ash...
Composite volcano
400
Two types of intrusions are dikes and sills. What is the difference between a dike and a sill?
Dike: Magma forces itself vertically, across layers and hardens. Sill: Magma squeezes between horizontal layers of rock.
400
What is a lava flow?
A lava flow is the area covered by lava as it flows out of the vent.
400
A pyroclastic flow is an explosive volcanic eruption that hurls out a mixture of...
hot gases,ash,cinders,and bombs
400
What is a basin?
A basin is a broad bowl-shaped valley.
500
Which volcano is high in silica and which is low in silica?
High: Cinder cone Low: Shield
500
What is a large mass of rock that cools inside the crust?
Batholith ex: Sierra Nevadas
500
A bowl-shaped area that may form at the vent of a volcano is a...
crater
500
What is a geyser?
A geyser is a fountain of water and steam that erupts from the ground.
500
How did Central Valley form?
The Sierra Nevada and Coast Ranges are on both sides of the valley creating the central valley between.
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