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  • 1. Volcanoes Quiet lava flows
  • 2. Volcano locations
  • 3. What is a volcano?• Volcano- Areas of earth’s surface through which magma and volcanic gases pass• Volcano comes from the Roman word Vulcan, which means “fire”
  • 4. What’s inside a volcano?• Magma Chamber- molten rock that feeds a volcano• Vents- cracks in the crust• What is the difference between magma and lava?
  • 5. VolcanoesMt. St. Helen before the explosive eruption
  • 6. Volcanoes
  • 7. VolcanoesTime lapse of the eruption
  • 8. VolcanoesMt. St. Helen after the eruption
  • 9. Volcanoes
  • 10. Volcanoes
  • 11. Eruptions and volcanic material GASES vent PYROCLASTIC MATERIALSvolcanic cone LAVA pipe (conduit) magma chamber
  • 12. Materials released in volcanic eruptionsPYROCLASTIC MATERIAL carbon dioxde ash water vapour sulphur lapilli gases carbon monoxide volcanic bombs GASES
  • 13. Materials released in volcanic eruptionsPYROCLASTIC MATERIAL carbon dioxde ash water vapour sulphur lapilli gases carbon monoxide volcanic bombs GASES
  • 14. Types of eruptionsHAWAIIAN STROMBOLIAN VULCANIAN
  • 15. Types of eruptions Shield volcano magma chamber central vent pipe (conduit) • magma temperature: very high (over 1,000 ºC) • very liquid lava HAWAIIAN • not very destructive nor explosive STROMBOLIAN VULCANIAN
  • 16. Types of Volcanoes• Shield Volcanoa) Built from layers of lavab) Non-explosive eruptionsc) Not very steep, but can be big
  • 17. Types of eruptions Stratovolcano (composite volcano) central volcanic cone vent magma chamber pipe (conduit) • magma temperature: moderate (700 - 1,000 ºC) • thick lava STROMBOLIAN HAWAIIAN STROMBOLIAN VULCANIAN • explosive pyroclastic material
  • 18. Types of Volcanoes• Composite Volcanoesa) Most common typeb) Explosive eruptions and lava flowc) Built from pyroclastic material AND lava
  • 19. Types of eruptions Dome volcano volcanic pipe of magma chamber solidified lava • magma temperature: low (less than 700 ºC) VULCANIAN HAWAIIAN • violent,STROMBOLIAN destructive explosions VULCANIAN • generally gases and ash are expelled
  • 20. Types of Volcanoes• Cinder Cone or dome Volcanoa) Built from pyroclastic materialb) Moderately explosive, short eruptionsc) Small in size, steep slopes