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Volcano's

Terms in this set (17)

Fissure
Lava erupts through long cracks in the ground.
Eruption
Unique, differing in size, style and composition of erupted material
Magma chambers
In the crust at 160 kilometers (100 miles) beneath surface
Viscosity
A liquid's resistance to flow
Explosive Eruption
Creats even more devastation that the force of the atom bomb dropped on nagasaki at the end of world war 2 in which more than 40,000 people died
Tephra
The erupted material
Pyroclastic flow
Scorching hot tephra, ash, and gas may speed down the volcanos slopes at 700 km/h
Lahar
Triggered a high speed puroclastic flow, which melted snow and created a volcanic mud flow
Active
Currently erupted or showing signs of erupting soon
Dormant
No current activity, but has erupted recently
Extinct
No activity for some time; will probably not erupt again
Composite volcanoes
Are made of felsic to intermediate rock
Shield Volcanoes
Are not steep, they may be very large, they are common at spreading centers or intraplate hot spots
Super volcano
Eruptions are extremely rare in earth history
Caldera
Surface collapses or creates a huge hole
Cynder cones
Most common type of volcano
Effusive Eruptions
Lava steadily flows out of a volcano onto the ground
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