Volcanic Eruptions 1 Why Volcanoes Erupt The F of expanding gas builds and pushes magma through the vent 2 Major Factors in Eruptions a The amount of trapped gas CO 2 and Sulfur b Silica Content ID: 276322
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Slide1
Volcano Types and
Volcanic EruptionsSlide2Slide3Slide4Slide5Slide6Slide7Slide8
1. Why Volcanoes Erupt:
The F of expanding gas builds and pushes magma through the ventSlide9
2. Major Factors in Eruptions:
a. The amount of trapped gas
CO
2
and Sulfur
b. Silica Content
The more silica, the more explosiveSlide10
C. Common Volcano Products
Ash
:
Fine rock particles, less than 1/10 of an inchSlide11
C. Common Volcano Products
Bombs
/Cinder
Rock pieces at least 2.5 inches to many feetSlide12
C. Common Volcano Products
Pyroclastic
Flow:
Mix of hot ash, bombs, gas, pumice and glass that can travel up to 100 miles per hour.Slide13
3. Common Volcano Types
Shield Volcano
Structure
Composition
Layers of built up lava
Eruption Type
Quiet
Lava Type
Pahoehoe
Hazards
Burning land, ash covered
Example
Hawaiian IslandsSlide14
3. Common Volcano Types
Cinder Cone
Structure
Composition
Layers of ash, cinders and bombs
Eruption Type
Explosive
Lava Type
Aa
Hazards
Deadly gasses, landslides, avalanche,
pyroclastic
flow
Example:
Paricutin, MexicoSlide15
3. Common Volcano Types
Composite
Structure
Composition
Alternate lava and ash
Eruption Type
Alternate Quiet and explosive
Lava Type
Pahoehoe
and
Aa
Hazards
Alternate
Example:
Mt. St. HelensSlide16
4. Volcanic Activity
a. Common Volcano LocationsSlide17
b. Volcanic Eruption simulation
http://discoverykids.com/games/volcano-explorer/Slide18
4. Volcanic Activity
b. Life Cycle:
Active
A volcano likely to erupt soon
Ex. Mt. Fuji and Mt. St. Helens
Dormant
A Volcano that may erupt in the future
Mt. Hood, Oregon and Mt. Kilimanjaro, Africa
Extinct
:
A volcano unlikely to erupt (10,000 years)
Mt.
Buninyong
, AustraliaSlide19