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13 Cards in this Set

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  • Back
describe nonexplosive eruptions
runny lava that seeps out and does not shoot into the air.
describe explosive eruptions
in an explosive eruption clouds of hot debree and gasses shoot into the air at supper sonic speeds
explain how magma composition causes different types of eruptions
if there is a high rate of silica in it it will be explosive if there is water then it will not be explosive
name the two major categories of material that erupt from a volcano
lava and pyroplastic myterial
describe the parts of a volcano
vent creater or central vent magma chamber
name and describe the different types of lava
block lava it dosent travel fare because it is so large.
pohoehoe the lava cools slowly makeing it look like waves.
Aa stiff surfas but hot underneath
Pillo lava cools quickly and looks like pillows.
name and describe the 3types of volcanoes
sheild Largest it is normaly non explosive and very runny so it is wide but not that tall.
Vomposit wide at bottom then small at the top.
cinder cone erodes quickly and is in size between the sheild and the composite.
define the following terms crater caldera lava platiau
creater central vent
caldera happens when magma chamber is empty and the roof colapses.
Lava platou is when the is a rift or a crack in the ground that lava comes out of and builds up to make a platou
how does magma form
when there is a rise in temperature and a decrease in preasure.
where do volcanoes form
they form were techtonic plates colide then preasure decreases and the mantal melts to magma. this area is also called the ring of fire
whatis the ring of fire
it is the area around one techtonic plate that all the volcanoes are next to.
what are hot spots
they are magma chambers were techtonic plates have shifted over it and form new volcanoes.
what are some ways that humans try to predict volcanoes
they use sismographes because normaly right before an eruption there are lots of small earth quackes.