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WHAT ARE VOLCANOES?

WHAT ARE VOLCANOES?. How do Volcanoes Form? Plate Tectonics!. Oceanic and Continental Plates. Volcanic Belts. Ring of Fire. Plate Boundaries. Yellowstone Cauldera. Hawaiian Islands are a Hot Spot. The Aleutian Islands are an Island Arc. Quick Review. 1. What is a volcano?

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WHAT ARE VOLCANOES?

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  1. WHAT ARE VOLCANOES?

  2. How do Volcanoes Form? Plate Tectonics!

  3. Oceanic and Continental Plates

  4. Volcanic Belts

  5. Ring of Fire

  6. Plate Boundaries

  7. Yellowstone Cauldera

  8. Hawaiian Islands are a Hot Spot

  9. The Aleutian Islands are an Island Arc

  10. Quick Review 1. What is a volcano? 2. How do volcanoes grow in size? 3. How are plate tectonics and volcanoes connected? 4. What is a volcanic belt? 5. Where is the Ring of Fire? 6. What is a hot spot volcano? 7. How are island arcs formed?

  11. How it Works When magma rises to the surface, the pressure of the surrounding rock decreases. this allows the dissolved gas in the magma to expand. the force of the expanding gas pushes magma from the chamber up into the pipe until it flows or explodes. Once magma escapes from the volcano, it becomes lava.

  12. All magma is not equal

  13. All magma is not equal

  14. Volcanic eruptions

  15. Quiet Eruptions

  16. Explosive Eruptions

  17. Pyroclastic Flow

  18. Pyroclastic Flow

  19. Deadly Results

  20. Pyroclastic Flow Debris Ash: less than 2 mms Ash covering

  21. Pyroclastic Flow Debris Cinders: 2mms-64mms

  22. Pyroclastic Flow Debris Bombs: larger than 64 mms A field of pyroclastic bombs

  23. Can you repeat that please? 1. How does a volcano work? 2. What is a crater? 3. What are the two types of lava? 4. What is viscosity? 5. How many types of eruptions are there? 6. What is a pyroclastic flow? 7. How do you classify pyroclastic debris?

  24. 3 different volcano types

  25. Lava Plateau

  26. Shield Volcano

  27. Shield Volcano

  28. Cinder Cone Volcanoes

  29. Cinder Cone Volcanoes

  30. Composite Volcano

  31. Composite Volcano

  32. Composite Volcano

  33. Caulderas

  34. Caulderas

  35. A Volcano’s Life Cycle ACTIVE a volcano that is erupting or has shown it may erupt in the future DORMANT a sleeping volcano that can awaken in the future and become active EXTINCT a dead volcano that is unlikely to erupt again.

  36. Let’s get it straight. 1. What are the three main types of volcanoes? 2. Name two other active volcano landforms. 3. Name the different types of eruptions. • Which volcanoes have quiet eruptions? 5. Which volcanoes have explosive eruptions? 6. Which volcano landform is the tallest and steepest? 7. Name the three sections of a volcano’s life cycle.

  37. Landforms from Magma Volcanic Necks Dikes, Sills Batholiths Dome mountains

  38. Volcanic Neck

  39. Dike

  40. Sill

  41. Batholith

  42. Dome Mountain

  43. Half Dome Yosemite

  44. Geothermal Activity Hot Springs Geysers Geothermal Energy

  45. Hot Springs

  46. Geyser: Old Faithful

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