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volcano a weak spot in the crust where molten material, or magma, come to the surface
lava when mag,ma reaches the surface
magma molten mixture of rock-forming substance, gases, and water from the mantle
ring of fire formed by the many volcanoes that rim the Pacific ocean
hot spot an area where material form deep within the mantle rises and then melts, forming magma
shield volcano gently sloping mountains formed by repeated lava flows
composite volcano formed by lava flows alternating with explosive eruptions
cinder cone volcano cone shaped mountain formed from ash, cinder, and bombs
sill when magma squeezes between horizontal layers of rock, forms sill
dike magma that forces itself across rock layer hardens into dike
;/batholith a mass of rock formed when a large body of magma cools inside the crust
lava plateau high, level area formed by repeated lava flows
extinct unlikely to erupt again
dormant might erupt anytime
active erupting and showing signs of erupting in the near future
element a substance that cannot be broken down into other substances
silica a rock that forms light-colored lava
basalt low-silica magma that forms rocks
phhoehoe hot, fast-moving lava
aa cool, slow-moving lava
viscosity physical property of liquid
compound substance made of two or more elements that have been chemically combined
volcanic ash rocky particle as small as a speck of dust
magma chamber magma collects in a pocket
crater a bowl shaped area that may form at the top of a volcano around the central vent
vent molten rock and gas leave the volcano through an opining
pipe magma moves upward through the pipe
caldera hole left by the collapse of a volcano mountain
geyser fountain that erupts from the ground
Created by: sajaalsabah2004