Chapter 3 Volcanoes

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

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