science6
Terms
undefined, object
copy deck
- 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