Hazards
Volcano Types
Control
Magma/Lava
Ect.
100
Ash made of tiny, sharp minerals and glass-like particles.
What is volcanic ash?
100
When basaltic lava erupts, it tends to spread out in flat layers. This creates ____ volcanoes.
Shield
100
Magma temperature and composition of magma/Visicosity
What controls volcanic eruptions?
100
Basaltic and granitic magma.
What are the two types of magma?
100
the material that changes the thickness of lava.
What is Silica?
200
Where a volcano erupts but not on a plate boundary.
What is a hot spot?
200
The volcano made of tephra
Cinder cone volcano
200
• High viscosity magma = high silica content = more explosive EX: RHYOLITE • Low viscosity magma = low silica content =less explosive (effusive) EX: BASALT
How does viscosity effect how the volcano erupts? Examples needed, too!
200
What are calderas?
Sometimes after an eruption, the top of a volcano can collapse. This produces a large deppression called a calderas.
200
the physical property that describes the material’s resistance to flow
What is Viscosity?
300
The fast moving hot lava.
What is Pahoehoe?
300
Stratovolcano = Mt. St. Helens
What kind of volcano is Mt. St. Helens
300
Magma and lava viscosity is also a function of temperature; therefore, a the viscosity of a lava flow will increase as its temperature decreases.
When does the lava viscosity increase?
300
Controlling eruptions
What is the most important role magma plays in eruptions?
300
Mt. Vesuvius
What caused the destruction of Pompeii?
400
caused by charged particles hitting storm clouds
What is Volcanic Lightning?
400
Stratovolcano
What is the most dangerous volcano?
400
Contains a low percentage of silica Typically has low viscosity(flows freely) Much thinner, more fluid magma
What is Basaltic magma?
400
Pillow Blocky Pahoehoe Aa
What are the types of lava?
400
Eyjafjallajökull
What is the volcano that erupted in Iceland?
500
a long-period wave caused by large bodies of water being displaced
What is a tsunami?
500
Mauna Loa is a shield volcano.
What type of volcano is Mauna Loa?
500
Contains a high percentage of silica Typically has a high viscosity(flows slowly) Sticky and lumpy
What is Granitic magma?
500
They are built up when the lava is too viscous to flow.
When are Lava domes built up?
500
Ojos del Salado
What is the tallest volcano in the world?
M
e
n
u