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32 Cards in this Set

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