Section 9.2 Volcanic Eruptions. What FACTORS determine if a volcano erupts violently or quietly?
1. 5.Volcanoes 2 3 When the plates of Earth collide, sometimes a volcano is formed Vocabulary...
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Transcript of 1. 5.Volcanoes 2 3 When the plates of Earth collide, sometimes a volcano is formed Vocabulary...
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5. Volcanoes
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When the plates of Earth collide, sometimes a volcano is
formedVocabulary
volcano
When the material from the mantle erupts onto the surface
and cools
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Vocabulary:
erupt
To burst out, or explode (like when a mixture of liquid rock and hot gases erupt from
a volcano)
Liquid rock, hot gases, pieces of rock, or a mixture of these may erupt from the volcano
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Not all volcanoes erupt in the same way
Some erupt quietly, while others erupt violently
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In a quiet eruption, lava flows slowly out of the volcano
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But sometimes, the vent in the volcano is plugged
Vocabulary:
vent
An opening in a volcano
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Then pressure builds up inside the volcano
And a violent eruption takes place
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In 1980, Mount St. Helens in the state of Washington
erupted violently
The blast blew 1,200 feet off the top of the mountain
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Different types of volcanic mountains are formed
depending on the kind of eruption and the materials that
pour out of the volcano
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Shield volcanoes formed the low, rounded mountains, like
Mauna Loa in Hawaii
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Vocabulary:
Shield volcano
A low, rounded mountain formed when lava spreads out
around a vent in a quiet eruption
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In 1943 a Mexican farmer noticed a hole in his cornfield
giving off smoke
Throughout the night hot glowing cinders were thrown
into the air
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Vocabulary:
cinders
Volcanic rocks about the size of golf balls
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In just a few days a cinder cone several hundred meters high
covered his cornfield
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Vocabulary:
Cinder cone
A cone shaped mountain made when a volcano erupts violently and throws cinders out the top
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This cinder cone volcano is called
Paricutin in Mexico in 1948
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Composite volcanoes are towering cone-shaped
mountains
Like Mount Fuji in Japan
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Vocabulary
Composite volcano
A volcano formed by layers of cinders and layers of lava flows
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Sang by:
Jimmy Buffet!