Chapter 3 Volcanoes

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

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