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50 Cards in this Set

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a moutian that forms when magma is forced to the earths surface
volcano
mamgma that flows onto the earthsd surface
lava
lava that is inside a vocano
magma
clouds of hot debris and gases shoot out from a volcano at supersonic speeds. no lava
explosive eruption
a resivor of molten rock materail benteath the earths surface
mamgma chamber aka magma resivoir
the opening in the earths surface which volcanic materials issue forth
vent
magma with high contents of water or silica generally produce what type of eruption
explosive
consists of fragments created by explosive volcanic eruptions
pyroclastic material
over many years volcanos have altered betweeen explosive and nonexplosive ______ ______
volcanic eruptions
ranges in consisticy from thick to thin
lava
cool stiff lava that cant travel far from the erupting vent. oozes is thick and comes in jagged chuncks
blocky lava
flowa slowly like wax dripping from a candle forms a glassy surface
pahoehoe
jagged surface that flows out quickly is from a hawaiin word
aa
forms when lava erupts underwater
pillow lava
what are the four tpes of lava
aa, pillow lava, pahoehoe, and blocky lava
what is the thicker slowest flowing type of lava
blocky lava
what is another mname for pyroclastic material
tephra
produced when magma explodes from a volcano and solidifies in the air
pyroclastic material aka tephra
largest pieces of pyroclastic material
volcanic blocks
large blobs of magma that harden in the air
volcanic bombs
means little stones. pebble like bits of magma that solidify before hitting the ground
lapilli
forms the gases in stiff magma expand rapidly and the walls of the gas bubbles explode into tiny glass like slivers
volcanic ash
can send ash downhill at tremrndous speeds choking and burning everything. can aslo be snt into the atmosphere
volcanic ash
result from tremedous amounts of lava erupting from fissurs
lava plateau
the temp and presure in the mantle is constant. magma is a mixture of liquid and solid mineral crystals
magma formation
ther are mostly convergent boundaries here
ring of fire
a rift forms as the plates seperate and the pressure decreases
volcano formation at diversion boundaries
subduction zones form mostly located at oceanic/contential plate boundaries
volcano formation at convergent boundaries
built from layers of lava from repeated nonexplosive eruptions very tall
sheild volcanos
small volcanic cones made entirly of pyroclastic material. steep sides and narrow base
cinder cone volcanos
aka strata volcanos.most coomon type is made from both pyroclastic material and lava. has a broad base that gets steeper torwads the summit
composite volcanos
a funnel shaped pit at the top of the central vent on most volcanos
craters
a large usually circular deppresion at the summit of a volcano formed when magma is withdrawn or erupted from a shallow underground mamgma
caldera
what are the three types of volcanos
cinder cone, composite, and sheild
result from tremedous amounts of lava erupting from fissures
lava plateau
most volcanic activity occurs here. mostly convergerent boundaries
the ring of fire
what is a rift
a deep crack
a rift forms, the plates seperate, magma fills the gap repeditly
volcano formation at divergent boundaries
oceanic/continetal plate collisions. subduction zones are formed.
volcanic formation at convergant boundaries
places on the earths surface that are directly above columns of magma called mantle plumes. ex. hawaii
hot spots
whats a mantle plume
columns of magma dirextly above the earths surface
have not erupted in recorded history and may never erupt again
exticnt volcanos
arent currently erupting but have erupted in recorderd history
dormant volcanos
are in the process of erupting or show signs of erupting in the future
active volcanos
most active volcanos produce small earthquakes as the magma rises and causes the surronding rock to sift
measuring small quakes
rise/run. bulges in the volcanos slope may form as magma pushes against the inside of the volcano
measuring slope
some scientist believe that a change in the ratio of certain gases may be an indicative of an upcoming eruption
measuring volcanic gases
satillite images recprd infrared radiation allowing scientist to track changes in temp. over time
measuring temp from orbit
some scientist believe that a change in the ratio of certain gases may be an indicative of an upcoming eruption
measuring volcanic gases
satillite images recprd infrared radiation allowing scientist to track changes in temp. over time
measuring temp from orbit