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Volcanoes

Mrs.Howard's 7th Period 6th Grade Volcano Study-Stack

TermDefinition
Volcano A weak spot in the crust where molten material, or magma, comes to the surface.
Magma A molten mixture of rock-forming substances, gases, and water from the mantle.
Volcanic Ash A dried powdery form of magma/lava.
Magma Chamber A pocket of magma in the earth.
Crater The cup-shaped depression or cavity on the surface of the earth or other heavenly body marking the orifice of a volcano.
Vent An opening at the earth's surface from which volcanic material, as lava, steam, or gas, is emitted.
Pipe The place where magma shoots out of in a volcano.
Lava Flow The flow of lava.
Ring of Fire A major volcanic belt formed by the many volcanoes that rim the Pacific Ocean.
Subduction When lava moves from convection waves from the oceanic crust to the continental crust.
Element A substance that cannot be broken down into any other substances.
Viscosity The physical property of liquids or the resistance of a liquid to flowing.
Silica A major ingredient in magma which is a compound made up of particles of the elements oxygen and silicon.
Pahoehoe Fast moving, hot lava that has low viscosity.
AA Cooler and slower moving lava with a high viscosity.
Compound A substance made up of two or more elements that have been chemically combined.
Lava Hot magma which has reached the Earth's surface.
Extinct A volcano that is unlikely to erupt again.
Dormant This type of volcano is not active now but it may show signs in the future.
Active A volcano that is erupting or has shown signs of erupting in the future.
Cinder Cone Volcano A steep cone-shape mountain or hill and small mountain. This type of volcano has high viscosity lava and produces ash, cinders, and bombs.
Composite/Strata Volcano Tall cone shaped volcanoes of which layers of lava alternate with layers of lava and ash.
Shield Volcano When lava flows gradually to build a wide, gently sloping mountain. This type of volcano rising on a hot spot built the Hawaiian Islands.
Caldera A huge hole left by the collapse of a volcanic mountain.
Batholith Large rock masses that form at the core of many mountain ranges.
Lava Plateau When volcanoes instead of forming mountains they form high level areas made of lava
sill When magma forces itself between layers of rock.
dike When magma squeezes between horizontal layers of rock.
hotspring A land mark that forms when groundwater is heated by a nearby body of magma or by hot rock deep underground. The hot water rises to the surface and collects in a natural pool.
geyser Sometimes, rising hot water and steam become trapped underground in a narrow crack.
Created by: 1970693329
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