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Volcanoes: A Study in Fire

Volcanoes: A Study in Fire . Another Fine Earth Science Presentation. Why Do We Have Volcanoes?. Magma (liquid rock) forms in areas of low pressure. Liquid rock much less dense, rises up into the crust. Magma eventually erupts on the surface (lava). Magma Sources.

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Volcanoes: A Study in Fire

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  1. Volcanoes: A Study in Fire Another Fine Earth Science Presentation

  2. Why Do We Have Volcanoes? • Magma (liquid rock) forms in areas of low pressure. • Liquid rock much less dense, rises up into the crust. • Magma eventually erupts on the surface (lava)

  3. Magma Sources

  4. Where Do Volcanoes Occur? • Subduction zones - Pacific Ring of Fire • Mid-Ocean Ridges • Hot Spots - areas of volcanism within plate boundaries (Hawaii)

  5. Pacific Ring of Fire

  6. Ring of Fire 2

  7. Subduction Zones (Mt. Fuji)

  8. Mid-Ocean Ridge

  9. Mid-Ocean Ridge 2

  10. Hotspots

  11. Hawaiian Volcano

  12. Hawaiian Eruption

  13. Lava

  14. Types of Magma/Lava • Mafic • Dark colored when hardened. • Flows easily. • Ocean crust. • Felsic • Light colored when hardened. • Resists flow. • Continental crust.

  15. Hawaii is mafic lava:

  16. Mt. St. Helens is felsic lava:

  17. After!

  18. Types of Volcanoes • Shield Cones • quiet eruptions, fluid/mafic lava • Hawaii • Cinder Cones • explosive ejected fragments • less fluid, but still mafic lava • Stratovolcano/Composite Cones • explosive eruptions, felsic lava, not fluid

  19. Shape Comparison

  20. Shield Cone - Hawaii

  21. Composite Cone - Mt. Adams

  22. Shield vs. Composite

  23. Cinder Cone Volcanoes

  24. Cinder Cone - Paracutin, Mexico

  25. Paracutin Erupts

  26. The Paracutin Run

  27. The town of Paracutin

  28. The End! Now let’s get out there and learn something.

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