Chapter 3 Volcanoes

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

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