Name:________________________________________________ Date:______________________ Period:__________________
Volcano Notes
• What are volcanoes?
A volcano is a mountain that forms when _____________________________
_____________________________________________________________________________
• Nonexplosive Eruptions
___________________________ is magma that flows onto the Earth’s surface.
____________________________come from nonexplosive eruptions.
• Explosive Eruptions
Clouds of _______________________________________ shoot out from the volcano at supersonic speeds.
Instead of lava flows, __________________________________ is blown into millions of pieces that
harden in the air.
Blasts of millions of tons of solid rock.
__________________________________ built out of layers of lava from repeated non explosive eruptions.
___________________________________________ - Small volcanic cones made entirely of pyroclastic material
from moderately explosive eruptions.
__________________________________________________ • Sometimes referred to as stratovolcanoes.
• The most common type of volcano.
• They form by explosive eruptions of pyroclastic material followed by quieter outpourings
of lava.
Explosive or Non Explosive?
• Why are some volcanic eruptions non explosive and some are explosive?
Name:________________________________________________ Date:______________________ Period:__________________
The ___________________________________________ from determines whether a volcanic eruption is
explosive, non explosive, or somewhere in between.
• Water –
A volcano will erupt explosively if its magma has a _____________________
_______________________________________.
Water turns to __________________________________________________________ (like shaking a can of coke
and opening it immediately)
• Silica –
Explosive eruptions are also caused by magma that contains ______
____________________________________________________________________________
Silica rich magma has a __________________________________________. (like Honey)
The silica rich magma clogs vents causing ________________________________.
•
The Main Process of a Violent Eruption:
• ______________________________________________________________________________________
______________________________________________________________________________________.
The hot magma rises to the top of the magma chamber and has no where to go but out of the vent
Ring of Fire
• The Ring of Fire is a _________________________________________________________________
_________________________________________________________________________________________
• Most Volcanoes form ________________________________________________________________
Volcano Eruption Prediction:
• To help predict volcanic eruptions, scientists classify volcanoes based on their
_______________________________________________________________________________.
• Active volcanoes usually produce _______________________________________________.
• Measurements of the ________________________ can help give scientists clues to predict the next
eruption.
• Measuring the outflow of ___________________________________ from a volcano can help scientists
predict eruptions.
• Measuring ________________________________________________________. (infrared radiation of heat)
What should you do in case of volcanic eruption?
• In the event of an impending volcanic eruption, you should ____________________________ the
area and take shelter.