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Volcanoes Advanced Organizer
1. What is a volcano? A volcano is a _________________ that forms when __________________________
and _________________________ erupt and build up around a _____________.
Most of Earth’s volcanoes are ___________________, meaning not active. There are over ______ active
volcanoes currently on Earth. Active means erupted in the last ____________ years.
Where is the nearest volcano to Tucson located? ___________________________________
2. Features of a volcano include:
________________ – melted rock/molten material ______________________________________________.
___________ – Opening in Earth’s surface where ________________________________________________.
__________ – Magma that has flowed _________________________________________________________.
________________ – Opening at the _____________________________________________________
Ash and Gas – Explode ______________________________________________.
3. Where do volcanoes occur? Volcanoes can occur at _____ places:
definition
1. 1. Divergent
Boundaries
2. Convergent
boundaries
3. Hot Spot
diagram
example
Volcanoes in Iceland
Andes mountains in
South America,
Cascade mountains
in NW USA
Hawaiian island
chain, Yellowstone
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4. _____ types of volcanic eruptions
Magma that contains trapped __________ causes eruptions to be ______________________. Think of
___________________ a can of soda and then opening it.
Explosive eruptions have a lot of _____________ in the magma, for example melted granitic rocks.
___________________________________is a good example of an explosive volcano.
Magma with _____________ silica is ___________________ and flows quietly from the volcano. Quiet
eruptions have ____________________ magma. Good examples of quiet eruptions are
________________________ and Iceland.
5. Shape of Volcanoes. There are ___ types of volcanoes, based on ____________________ and eruption
________________.
definition
sketch
Shield
Composite
Cinder cone
Video: Volcano Krakatoa
Where is it located?
How fast is Anak Krakatau (child of Krakatoa) growing?
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