-
dormant volcano
might erupt again
-
movement of one tectonic
plate under another
subduction
-
large depression that forms when the magma chamber partially empties is a
caldera
-
combination of explosive and nonexplosive eruptions will create a
composite volcano
-
has steep slopes
cinder cone volcano
-
expect after an explosive eruption
darkened skies, cooler temperatures
-
Large blobs of magma that harden in the air
volcanic bombs
-
a high viscosity
thick, like pudding
-
forms when lava erupts under water
Pillow lava
-
see during a nonexplosive eruption
calm lava flows
-
magma explodes into the air and hardens
Pyroclastic material
-
pyroclastic material that can reach the upper atmosphere and circle the Earth for years
volcanic ash
-
lapilli
pyroclastic material gets its name from a word that means “little stones”
-
stiff lava that forms jumbled heaps of sharp chunks near the vent
blocky lava
-
lava flows most like dripping wax
pahoehoe lava
-
viscosity of lava
how the lava flows
-
water content of magma is high
explosive eruption is more likely
-
Lava that is very runny
has a low silica content
-
molten rock deep
underground often gathers in
magma chamber
-
volcanoes most likely to form
along plate boundaries
-
volcanoes are created by
repeated eruptions of lava
-
active volcano
is currently erupting or will erupt very soon
-
extinct volcano
- will probably never erupt
- again
-
tgently sloping sides
shield volcano
-
Volcanic activity is common along the Mid-Atlantic Ridge
divergent boundary
-
predicting volcanic eruptions
- the composition of volcanic gases, internal temperature,
- changes in the volcano’s slope
-
Lava that has a fluid, runny consistency probably
has a low silica content
-
along plate boundaries
Volcanoes are most likely to form
-
A tiltmeter is an instrument that measures
changes in a volcano’s slope
-
volcano is most likely to erupt in the near future
an active volcano
-
volcanoes of Hawaii and other places far from tectonic plate boundaries are known as
hot spots
-
oceanic plate collides with a continental plate, the oceanic plate is usually subducted because
oceanic crust is denser and thinner than continental crust
-
active volcanoes form
where tectonic plates collide
-
rock begins to melt when
temperature increases and pressure decreases
-
depression created when the roof of a magma chamber collapses
caldera
-
three main types of volcanoes
shield, composite, and cinder cone
-
climate change caused by a volcanic eruption
ash blocks sunlight, causing temperatures to drop
-
infrared images show that an area is getting hotter
Magma is rising in an active volcano
-
5% of volcanoes on land form
in hot spots
-
-
Mount Rainier and Mount St. Helens
composite volcanoes
-
most destructive volcanic eruption
explosive
-
repeated eruptions of lava create
volcanoes
-
volcano will probably never erupt again
an extinct volcano
-
volcano is most likely to erupt soon
active volcano
-
climate change caused by a volcanic eruption
ash blocks sunlight, causing temperatures to drop
-
magma that blasts into the air and hardens
pyroclastic material
-
water content of magma is high
explosive eruption is likely
-
create volcanoes
many eruptions of lava
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