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Parts of a Volcano
Types of Volcanoes
Volcanic Activity in California
Volcanic Formations
More Volcanic Formations
100
Lava underground.
What is magma?
100
A volcano that will never erupt again.
What is extinct?
100
This formed the Sierra Nevada mountains.
What is a batholith?
100
When magma forces itself between rock layers and hardens.
What is a sill?
100
Magma that is forced across rock layers and hardens.
What is a dike?
200
The long tube in the ground that connects the magma chamber to Earth’s surface.
What is a pipe?
200
A volcano that is sleeping or not active but could erupt again.
What is dormant?
200
A valley the runs from north to south between two mountain ranges created by volcanic activity.
What is the Central Valley?
200
A fountain of water and steam formed by water heated from volcanic activity.
What is a geyser?
200
A mixture of gasses, hot ash, cinders and chucks of lava that flow down the sides of a volcano like an avalanche.
What is a pyroclastic flow?
300
A pocket below ground that collects magma.
What is a magma chamber?
300
Lava flows out and hardens and builds up in layers.
What is a shield volcano?
300
Mountains that surround a basin called the central valley.
What is the Sierra Nevada and California Coastal mountain ranges?
300
A huge hole left after the collapse of a volcano.
What is a caldera?
300
The formation of the Hawaiian Islands is one example.
What is a hot spot?
400
An opening in the volcano where gasses and lava escape.
What is a vent?
400
Ash, cinders, and bombs build up in a steep pile around a volcano’s vent.
What is a cinder cone volcano?
400
Two dormant volcanoes in California.
What are Mount Shasta and Mount Lassen?
400
Magma cools and hardens in a volcanic vent, then the rest of the mountain erodes.
What is a volcanic neck?
400
It is made up of rocky particles about the size of a grain of sand.
What is volcanic ash?
500
A bowl shaped area that may form around the top or the central vent.
What is crater?
500
Sometimes there are violent eruptions, sometimes lava flows from it and sometimes it is quiet.
What is a composite volcano?
500
Where the Pacific and North American plates meet in California.
What is the San Andreas Fault.
500
Rock that forces itself between rock layers and is always younger than the rock around it.
What is an intrusion?
500
It is formed as the result of an explosive eruption.
What is pumice?