Lesson

• Volcano - caused by convergent
• Creater - opening of volcano
• 3 classification of volcano

  • active

  • dormant

  • extinct
• Active - recent history of eruption, likely to erupt
• Dormant - not erupted for a very long time but may erupt at a future time
• Extinct -not erupted for at least ten thousand years and not expected and not expected to erupt again
• Volcanic hazard type

  • lahar

  • Ashfall / tephra

  • pyroclastic flow

  • ballistic projectiles

  • volcanic gases

  • lava flows

  • local earthquake

  • tsunamies
• Types of volcano

  • cinder cone volcanoes

  • composite volcanoes

  • shield volcanoes

  • lava domes

  • caldera
• Cinder cone - single vent blown in the air
• Stratovolcano or composite - perfect cone, has conduit system
• Shield volcanoes - build with fluid lava, flow of lava is downward
• Lava dome - formed by relatively small, bulging masses of lava to viscous to flow any great distance. Mixed with cinder cone, composite volcano, shield volcano.
• Caldera - most powerful catastrophic volcano due to massive pressure
• Lahar - contains ash and rain, destructive mudflow
• Ashfall / tephra - airbone, mixed with ash and air
• Pyroclastic flow - gas and rock or aka tephra
• Ballistic projectiles - cannonball
• Volcanic gases - emits gases hydrogen sulphide ( h2s) and sulphur dioxide (so2)
• Lava flows - extremely hot molten
• Tsunamies - japanese “ harbor wave” or tidal wave