Volcanoes Guided Notes Part I

Volcanoes Guided Notes


Part 1

Multiple Choice

An opening in the earth’s crust through which magma erupts.

• Earthquake

• Volcano

• Sinkhole

Magma

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As magma forms, it flows ​

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through cracks in the rock above it.

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• If it reaches the surface, it

  through a volcano.

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Magma that erupts through a volcano onto the surface of the earth is called

.

Drag and Drop

Viscosity – the ability of a liquid to ​

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flowing

Corn Syrup: ​

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viscosity

Baby Oil: ​

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viscosity

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resist

High

Low

increase

reduce

Kinds of Eruptions

Rift Eruptions

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• Occur at long, narrow

  in the crust

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Occur at

boundaries

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• May be on the ocean

  or on land

Subduction Boundary Eruptions

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Occur at ​

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boundaries

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Occurs in ​

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zones

Most of the world’s active volcanoes occur at subduction boundaries

Ex. Japan, Philippines, Cascades, Andes

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Lava, steam and ash are ejected violently

Like earthquakes, volcanoes tend to occur at plate boundaries!

The exceptions are...

Hot Spots

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Occurs at areas of volcanic activity in the

of a lithospheric plate

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Eruption can be

or non-explosive.

The cause of hot spots is unclear!

Examples:

Hawaiian Islands
Yellowstone National Park
Mount St. Helens