volcanic hazards
Cards (17)
- Volcano - is a vent or 'chimney' that connects molten rock (magma) from within the Earth’s crust to the Earth's surface.
- 3 STAGES OF VOLCANO
- Active
- Dormant
- Extinct
- Active - Often erupts
- Dormant - Has not erupted for 2000 years
- Extinct - has not erupted for at least 10,000 years
- TYPES OF LAVA FLOW
- Andesitic Flow
- Basaltic Flow
- Rhyolitic Lava Flow
- Andesitic Lava Flow
- Forms lava domes
- Comes in small volume
- Basaltic Lava Flow
- Fastest
- Low Viscosity
- Rhyolitic Lava Flow
- High Viscosity
- Slowest
- Associated with violent eruptions
- Sheet Lava Flow
- Thicker surface
- Associated with violent eruptions
- Pillow Lava Flow
- Pillow shaped
- Underwater lava
- OTHER TYPES OF LAVA FLOW
- Sheet Lava Flow
- Pillow Lava Flow
- Volcanic Gases
- Carbon Dioxide
- Carbon Monoxide
- Ammonia
- Sulfur Dioxide
- Sulfuric Acid
- Fluoride
- Hydrogen Sulfide
- Hydrogen Fluoride
- Hydrochloric acid
- Pyroclastic flow is a hot mixture of:Â
- Fresh lava
- Gas
- Rock
- Pumice
- AshÂ
- Tephra - refers to volcanic rock and lava materials that are ejected to air during an eruption.
- TYPES OF TEPHRA DEPOSITS
- Pele's tears
- Pele's hair
- Scoria
- Pumice
- LAHAR FLOW
- A mixture of fresh volcanic material and water
- Formed by heavy rainfall or melted polar ice cap