Chapter 7 - Section 3 - Volcanic Eruptions Flashcards
What are the main parts of a volcano?
crater
vent
pipe
side vent
lava flow
magma chamber
As a volcano erupts, what force pushes magma out of a volcano onto the surface?
expanding gases
What are the two main kinds of volcanic eruptions?
quiet
explosive
What properties of magma help to determine the type of eruption?
A volcano erupts quietly if its magma is low in silica
A volcano erupts explosively if its magma is high in silica.
What are the three stages of volcanic activity?
active
dormant
extinct
Name 3 hazards of volcanic eruptions.
Volcanic ash can:
- bury entire towns.
- cause roofs to collapse.
- stall the engine of a plane.
Eruptions can cause landslides and avalanches of mud, melted snow, and rock
magma chamber
The pocket beneath a volcano where magma collects.
pipe
A long tube through which magma moves from the magma chamber to Earth’s surface.
vent
The opening through which molten rock and gas leave a volcano.
lava flow
The area covered by lava as it pours out of a volcano’s vent.
crater
A bowl-shaped area that forms around a volcano’s central opening.
pyroclastic flow
The expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption.
dormant volcano
A volcano that is not currently active, but may become active in the future.
extinct volcano
A volcano that is no longer active and is unlikely to erupt again.
What happens to the pressure in magma as the magma rises toward the surface?
it decreases
