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lkelly
Volcanoes
20
Science
7th Grade
03/30/2014

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Term
Volcano
Definition
an opening in the Earth’s crust that erupts gases, ash, and lava
Term
Vent
Definition
opening where magma escapes
Term
Crater
Definition
steep sided depression inside a volcano
Term
WHERE DO THEY OCCUR
Definition
divergent boundaries- i.e. Iceland
convergent boundaries- most common
-”ring of fire”- pacific rim
hot spots- weak spot in crust
-Hawaiian islands
Term
am’t of dissolved gases and water vapor
Definition
more gases, more explosive
- more trapped water at convergent boundaries (from ocean)
Term
am’t of silica (“glue”)
Definition
- more silica, more explosives
Term
shield volcano
Definition
gentle slope (mostly lava)
Term
cinder cone
Definition
steep slope (mostly ash)
Term
tephra
Definition
clumps of airborne ash
Term
composite cone
Definition
intermediate slope (ash and lava mix)
Term
HUMAN IMPACT
Definition
lava flows cover property (Hawaii)
Term
HUMAN IMPACT
Definition
covered with ash (Pompeii, Italy)
Term
HUMAN IMPACT
Definition
poisonous gases cause acid rain
Term
HUMAN IMPACT
Definition
fires from burning ash or hot lava (Hawaii)
Term
what does V.E.I. stand for
Definition
Volcanic Explosive Index
Term
What was the largest volcanic eruption of historic times
Definition
Mt. Tambora
Term
What was the volcano that buried Pompeii
Definition
Mt. Vesuvius
Term
what were the people in Pompeii buried in
Definition
ash
Term
between 1600 and 1982, where in the world have the most people died from volcanoes
Definition
Indonesia
Term
what was the most destructive volcano in U.S. history
Definition
Mt. Saint Helens
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