blockylava		volcano made from alternating layers of lava and pyroclastic material
active		a mountain that forms when molten rock is forced to the earth's surface
compositevolcano		small, steeply sloped volcano that forms from moderately explosive volcanic eruptions
rift		lava that is jagged
fissure		when lava erupts from long cracks
AA		magma that flows onto the earth's surface
magma		large, gently sloped volcano that forms from moderately explosive eruptions
pahoehoe		2 things that magma is made out of
plateboundaries		volcanoes that surround the pacific ocean
crater		pebble like bits of magma that became solid before they hit the ground
volcano		funnel shaped pit around the central vent of a volcano
caldera		circular depression forming when a magma chamber empties and causes the ground above to sink
tiltmeter		molten rock that stays in the earth's crust
ringoffire		lava that oozes from a volcano
cinderconevolcano		volcanos that are erupting at this time are called
silicaandwater		most volcanic activity takes place along these
pyroclasticmaterial		earthquakes are measured with this
hotspot		lava that flows slowly forming a glassy surface with rounded wrinkles
lapilli		deep crack that forms between tectonic plates as they seperate
seismograph		an instrument attached to the surface of the volcano which detects changes in angle of slope
pillowlava		consists of rock fragments created by explosive eruptions
lava		place on the surface of the earth directly above the column of magma called a mantle plume
shieldvolcano		forms when lava erupts underwater