Exam 5: Volcanoes and Volcanism

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Why are some places (e.g. ,northern California)more likely to experience volcanic eruptions than others (e.g. ,New York)?

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Volcanoes are located on convergent or divergent plate boundaries.Places within plates may experience volcanism if they are over a hot spot.

Which type of volcano is Mount St.Helens?

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A composite volcano.

Sometimes,the pyroclastic material that flows from a volcano is so hot that it fuses together to form a deposit known as ____________________.

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welded tuff

What other bodies in the solar system are thought to possess active volcanoes?

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How are cinder cones different from the other two major types of volcanoes?

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Most of the approximately 3,300 historic eruptions lasted:

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Explosive eruptions take place in a few hours and then are over until gases can build up again,usually not for several decades.

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What is volcanism,and what types of rocks does it produce?

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The one place on Earth where mid-oceanic ridge volcanism occurs above sea level is ____________________.

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Composite volcanoes are composed of the igneous rock type known as ____________________,which forms from lava of ____________________ composition and viscosity.

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Mauna Loa volcano in Hawaii is huge and has gentle slopes;Mount Rainier in Washington is tall,with much steeper slopes;and Paricutín in Mexico is smaller and has very steep slopes composed of loose pyroclastic material.What type of volcano does each one represent,and what kind of volcanic activity produced it?

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Pahoehoe is lava erupted by Hawaiian volcanoes that has a(n)____________________ viscosity and a(n)____________________ appearance.

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Which is the correct ranking of regions with the most active volcanoes and volcanic activity? 1)Circum-Pacific belt 2)Mid-oceanic ridges 3)Mediterranean belt 4)Isolated sites like the Hawaiian Islands

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What is vog,and who named it? What are its risks?

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Lava flows are the greatest hazard of volcanoes.

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Pyroclastic material that is less than 2 mm in diameter is called ____________________.Particles ranging from 2 to 64 mm in diameter are known as ____________________,while ____________________ and ____________________ are pieces larger than 64 mm in diameter.

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One common but dangerous gas emitted from volcanoes,which was responsible for many deaths in Cameroon,is ____________________.

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Look at the map of volcanoes of the world,and describe where most of the world's volcanoes are found.

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Basalt plateaus erupt from:

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How do pillow lavas form?

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