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32 Cards in this Set
- Front
- Back
Volcano
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a weak spot in the crust where molten material or magma comes to the surface
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Magma
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a mixture of rock-forming substances, gases, and water from the mantle
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Lava
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magma when it reachs the surface
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Ring of Fire
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a major volcanice belt, formed by many volcanoes that rim the Pacific Ocean
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island arc
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are stings of islands that are formed when sea-floor spreading and subduction occurs
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hot spot
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is an area where material deep from within the mantle rises and melts, forming magma
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element
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is a substance thatcannot be broken down into other substances
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compound
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a substance made up of two or more elements that have been chemically combined
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pyhsical property
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is any characteristic of a substance that can be measured without changing the composition of the substance
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chemical property
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is any property that produces a change in the compositionof matter
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viscosity
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the pyhsical property of liqueds and the resistance of a liqued to flow
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silica
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a compound made up of particales of the elements oxygen and silicon
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pahoehoe
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fast moving, hot,lava that has a low viscosity
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aa
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lava that is cooler and flows slower and has a high viscosity
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magma chamber
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a place beneath the volcano where magma collects
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pipe
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a long tube in the ground that connects the magma chamber to Earth's surface which magma travel up through
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vent
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an opening in the volcano where molten rock and gas leave the volcano
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lava flow
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an area covered by lava as it pours out of a vent
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crater
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a bowl shaped area that may form at the top of the volcano around the central vent
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pyroclastic flow
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occurs when an explosive eruption hurls out a mixture ofhot gases, ash, cinders,and bombs
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dormant
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a sleeping volcano that may awaken and become active in the future
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extinct
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a volcano that is unlikly to erupt again
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sheild volcano
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thin layers of lava pour out of vents gradually building a wide, gently sloping mountain
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cinder cone
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ash,cinders,and bombs build up around the vent in a steep,cone shaped hill or small mountain
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composite volcano
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are tall, cone shaped mountains in which layers of lava alternate with layers of ash
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caldera
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the huge whole left by the collapse of a volcanic mountain
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volcanic neck
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forms when magma hardens in a volcano's pipe
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dike
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when magma forces its self across rock layers
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sill
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when magma squeezes between horizontal layers of rock
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batholith
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is a mass of rock formed when a large body of magma cools inside the curst
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geothermal activity
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magna a few kilometers beneath Earth's curst heats unground water
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geyser
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is a fountain of water and steam that erupts from the ground
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