test 2 Flashcards
inside of earth
magma
once a volcano erupts and it comes out
lava
what happens as lava cools
it makes an eruption and builds higher and higher
what are the two types of basaltic lava flows
Aa & Pahoehoe
a basaltic lava flow with a blocky texture and thick lava
Aa
a basaltic lava flow with a rope and fluid lava
Pahoehoe
can move up to 30 km/hr at the top, slows as it reaches the bottom to the point that you can walk on it; hotter at the top of volcano; cools toward bottom
basaltic lava flows
glowing cloud of pyroclastic debris
Nuee Ardent
mudflow of water mixed with tephra
Lahar
what determines the name of the pyroclastic debris
its size
what are the types of pyroclastic debris
tephra, nuee ardent, lahar
what is ash and lapilli
little stones
what is a fissure eruption
a crack in the surface of the earth
an opening exposed on the easrths where volcanic material is emitted
volcaninc vent
magma that has a high viscosity and high silica and gas content; eruption tends to be very explosive- this is usually associated with supervolcanoes like yellowstone
rhyolitic magma
huge hole left by the collapse of a volcanic mountain
caldera
an opening exposed on the earths surface where volcanic material is emitted
volcanic vent
magma that is a mix of basaltic and rhyolitic; eruption may or may not be explosive (usually dangerous though)
andesitic magma
the smallest type of tephra
volcanic ash and dust
largest volcano in the solar system and type
olympus mons- shield volcano on mars
locations where plumes of magma burn through the earths surface even though it is not on a plate boundary
hot spot volcanism
mt st helens is an example of this kind of volcanism
convergent volcanism
more viscous (thicker or stickier) lavas, much more explosive eruptions; tall with steep sides, these are the most common large cones
composite or stratovolcano
magma with the least amount of silica, rarely explosive eruption- the magma is the hottest and the runniest
basaltic magma
describes all the processes associated with the discharge of magma, hot water, and steam
volcanism
where plates separate, magma rises to fill gaps
divergent volcanism
types of volcanism that occurs due to subduction
convergent volcanism
hawaii is an example of this kind of volcanism
hot spot volcanism
bowl or circular shapes depression around the vent
volcanic crater
an underground pool that holds magma, below a volcano
magma chamber
gently sloping sides, quiet eruptions, magma is very runny (low viscosity)
shield volcano
a small volcano built primarily of pyroclastic material ejected from a single vent; they can occur anywhere
cinder cone
lava that is sharp when cool and crumbles into large jagged chunks
aa lava
bits of rock or solidified lava dropped from the air during an explosive volcanic eruption; ranges in size from volcanic ash to volcanic bombs and blocks
tephra
pebble like bits of magma that cool in the air
lapilli
a violent type of mudflow coming from the melted snow or glacier on the top of a volcano; it often kills many more people and animals than the eruption itself
lahar
ocean to continent convergence is usually associated with this type of magma
andestic
ocean plate hotspot volcanism or ocean to ocean convergence or ocean to ocean divergence is associated with this type of magma chamber
basaltic
continental plate hotspot volcanism is associated with this type of magma chamber
rhyolitic
widest of all volcanoes
shield volcano
ring of fire volcanic cone type
composite
crater formed after the collapse of an emptied magma chamber
caldera
built from nonexplosive eruptions and has gently sloping sides and a large base
shield volcano
composite volcano also known as
stratovolcano
a volcano built up of alternate layers of lava/ask with explosive eruptions
stratovolcano
ropey, basaltic lava flow
pahoehoe
rhyolitic magma is thick and sticky because
of high silica content; it forms from melted continental crust
low viscosity, high temps, and low silica
basaltic magma
three types of magma are
basaltic, andesitic, and rhyolitic
low viscosity magma is associated with
high temps, less trapped gas, and lower silica content
the viscosity of magma depends on
temp and silica levels
stratovolcanoes are associated with what type of plate boundary
convergent (subduction zone) O:C
shield volcanoes are associated with what type of plate boundary
convergent O:O or hot spot under oceanic plate
what is lapilli
bits of lava that hardens in the air, (pebbles)
ash, blocks, and bombs are pieces of
tephra
a mudflow composed of pyroclastic material and water
lahar
superheated gas and ash that speeds downhill from an eruption
nuee ardent
how many major eruptions has yellowstone caldera had over the years
3
what national park is actually a supervolcano
yellowstone
produces aa and pahoehoe lava
shield
what is magma
molten rock inside earth
what is lava
molten rock that flows onto the earths surface
second most explosive type of volcano, like dantes peak
composite/stratovolcano
volcanoes that form far from plate boundaries are associated with
hot spots
elements associated with basaltic magma are dense and dark. what are the 3 main elements in this type of magma
iron, magnesium, and calcium
elements associated with rhyolitic magma are light in color and low density. what do they have the highest percentage of
silicon and oxygen
equation for silicon dioxide; the higher the percentage of this, the thicker and more dangerous the magma
SIO2
which type of magma is in the middle, it still has violent eruptions, but not like super eruption
andesitic
dantes peak was loosley based on which volcanic eruption in the us
mount saint helens
5 parts that make a mineral
definite chemical composition, crystal pattern, solid, inorganic, naturally occuring
minerals form from
cooling of magma or lava, precipitation from water, recrystallization from other minerals
a scale ranking ten minerals from softed to hardest; used in testing the hardness of minerals
mohs hardness scale
the way a mineral reflects light from its surface
luster
shiny like glass
vitreous luster
shiny like metal
metallic luster
the color of a mineral in powdered form that is sometimes different from the color of the mineral
streak
the tendency of a mineral to break along flat surfaces and form regular shapes everytime it is broken
cleavage
minerals that dont form regular shapes when they break have
fracture
relationships between temperature and volume
direct (higher temp- higher vol; lower temp- lower volume)
charles law
v1/T1=V2/T2