Chapter 3 Volcanoes

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Can you name the Chapter 3 Key Terms?

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DefinitionTerm
The area covered by lava as it pours out of a vent
A substance made of two or more elements that have been chemically combined
Fine, rocky particles as small as a speck of dust that come out of a volcano
As the amount of silica in magma increases, the viscosity of the magma _____.
The greater the viscosity of a liquid, the ____ it flows.
The factor that the viscosity of magma depends on
A mass of rock formed when a large body of magma cools inside the crust
The lower the viscosity of a liquid, the ______ it flows.
Boundary where two plates move together
Boundary where two plates move apart
A dead volcano that is unlikely to erupt again
A fountain of water and steam that erupts from the ground
Density, harndess, melting point, boiling point, and magnetism are all this type of property
A substance that cannot be broken down into other substances
U.S. state that formed over millions of years as the Pacific plate drifted over a hot spot
Magma beneath Earth's surface heats underground water
A weak spot in the crust where molten material, or magma, comes to the surface
A volcano that may awaken in the future and become active
When magma squeezes between horizontal layers of rock, it forms this
Large pieces that come out of a volcano
Pebble-sized particles that come out of a volcano
Magma that forces itself across rock layers and then hardens
As the temperature of magma increases, its viscosity _____.
Opening in a volcano where molten rock and gas leave
A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening
DefinitionTerm
Any property that produces a change in the composition of matter
Type of volcano that is erupting or has shown signs that it may erupt in the near future
Pocket beneath a volcano where magma collects
Ability to burn and ability to reach are this type of property
The resistance of a liquid to flowing
Forms when magam hardens in a volcano' pipe
Magma that is low in silica produces this type of eruption
A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions.
________ among a liquid's particles causes liquids to have different viscosities.
Magma that is high in silica produces this type of eruption
A natural pool of water that is heated by geothermal activity
Lava that is cool and slow moving
As the temperature of magma decreases, its viscosity _____.
This occurs when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs
A major volcanic belt formed b y the many volcanoes that rim the Pacific Ocean
The less silica magma contains, the _____ its viscosity.
Fast-moving, hot loava that has low viscosity
When magma reaches the surface, this is what it's called
Any characteristic of a substance that can be observed or measured withough changing the composition of the substance
A long tube in the ground that connects the magma chamber to Earth's surface
The huge hole left by the collapse of a volcanic mountain
A bowl-shaped area that may form at the top of a volcano around the central vent
A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials
Where volcanic belts form
An area where material from deep within the mantle rises and then melts, forming magma

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