Chapter 3 Volcanoes

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

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