volcanoes
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28 Terms
crater
the opening at the top of a volcano
ash cloud
ash that is ejected from the crater during an eruption
lava flow
malted rock that flows from the crater during on eruption
side vent
an opening on the side of a volcano where an eruption can occur
main vent
the channel down the middle of the volcano where magma can reach the surface becoming lava
magma chamber
a large packet underneath a volcano that holds a pool of liquid rock under high pressure
kilauea
the most active volcano
most volcanoes are ….
dormant
earth is cover in water so …
most volcanic eruption occurs underwater
volcanoes form at …
divergent boundaries and subduction zones
where earthquakes and volcanoes are common
Pacific Ring of Fire
how you know a volcano is balut the erupt
earthquakes occur at the volcano
gases and ash escape the creator
cracks appear around the creator
the ground swells due to magma building up below the surface
shield volcano
broad based gently slopped made of hardened lava is the least explosive
cinder cone volcano
steep sided, and cone shaped made of tephra medium eruptions
tephra
lava that is shot in the air and cools and breaks
composite volcano or stratovolcano
tallest volcanoes with steep sides and cone shaped made of altering layers of lava and tephra the explosive and dangerous
explosive factors
composition of magma, gasses and water determine the viscosity of the magma and how explosive it will erupt
viscosity
resistance of lava to flow
high viscosity
slow flow and explosive eruption
low viscosity
fast flow and non explosive eruptions
basaltic magma
low silica, flows easily, produce nonexplosive eruption
andesitic magma
intermediate silica, sometimes produces explosive eruptions
rhyolitic magma
high in silica, usally produces explosive eruptions
lava
magma that reaches earths surface
pyroclastic flow
a dence super heated clod thst tralves a t a spped greater then 100km
ash
diameter diameter less then 2mm
lapilli
diameter 2 to 64mm
bombs/blocks of rock
diameter greater than 64mm
Note 
Flashcards (39)