Volcanoes

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Volcanoes

  1. 1. Volcanoes Quiet lava flows
  2. 2. Volcano locations
  3. 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. 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. 5. VolcanoesMt. St. Helen before the explosive eruption
  6. 6. Volcanoes
  7. 7. VolcanoesTime lapse of the eruption
  8. 8. VolcanoesMt. St. Helen after the eruption
  9. 9. Volcanoes
  10. 10. Volcanoes
  11. 11. Eruptions and volcanic material GASES vent PYROCLASTIC MATERIALSvolcanic cone LAVA pipe (conduit) magma chamber
  12. 12. Materials released in volcanic eruptionsPYROCLASTIC MATERIAL carbon dioxde ash water vapour sulphur lapilli gases carbon monoxide volcanic bombs GASES
  13. 13. Materials released in volcanic eruptionsPYROCLASTIC MATERIAL carbon dioxde ash water vapour sulphur lapilli gases carbon monoxide volcanic bombs GASES
  14. 14. Types of eruptionsHAWAIIAN STROMBOLIAN VULCANIAN
  15. 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. 16. Types of Volcanoes• Shield Volcanoa) Built from layers of lavab) Non-explosive eruptionsc) Not very steep, but can be big
  17. 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. 18. Types of Volcanoes• Composite Volcanoesa) Most common typeb) Explosive eruptions and lava flowc) Built from pyroclastic material AND lava
  19. 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. 20. Types of Volcanoes• Cinder Cone or dome Volcanoa) Built from pyroclastic materialb) Moderately explosive, short eruptionsc) Small in size, steep slopes

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