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The World of Volcanoes

The World of Volcanoes. Mrs. Lozano. What is a volcano? . A mountain formed by lava and ash. What is Lava?. Lava is magma that reaches Earth’s surface. Okay...I know what lava is, but what exactly is Magma ? Magma is hot, soft rock from Earth’s mantle. What is ash?.

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The World of Volcanoes

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  1. The World of Volcanoes Mrs. Lozano

  2. What is a volcano? • A mountain formed by lava and ash

  3. What is Lava? • Lava is magma that reaches Earth’s surface

  4. Okay...I know what lava is, but what exactly is Magma? • Magma is hot, soft rock from Earth’s mantle.

  5. What is ash? • Ash is small pieces of hardened lava

  6. Savage Earth Animation

  7. How do volcanoes form? • Continental plates and oceanic plates collide • Subduction occurs • Melted rock becomes magma that forces its way up between the plates • Savage Earth Animation #2

  8. How do volcanoes form?

  9. Continental Drift • Continental Drift Animation

  10. Where are these “Subduction Zones?” • Many volcanoes are located at plate boundaries around the Pacific plate. • The Pacific plate is often called the “Ring of Fire”

  11. Do all volcanoes look the same? • No, there are many different kinds of volcanoes such as: • Shield Volcanoes that can be found in Hawaii

  12. Cinder Cone Volcanoes can be found in Costa Rica

  13. Composite Volcanoes like Mt. Saint Helen

  14. And Fissure Volcanoes found in Nicaragua .

  15. Do subduction zones create all volcanoes? • No, volcanoes can also be formed by Hot Spots. • Hot Spots are volcanic areas on the surface of the Earth that are created by a rising plume of magma. • http://www.classzone.com/books/earth_science/terc/content/investigations/es0810/es0810page03.cfm

  16. Volcanic Hazards • Volcanoes can create landslides that bury land, homes and sometimes people.

  17. Volcanic Hazards • Volcanoes can create Earthquakes that may produce hazards which include ground cracks, ground deformation, and damage to manmade structures.

  18. Volcanic Hazards • Pyroclastic Surge that spews extremely hot ash that races down the mountain and swallows everything in its path.

  19. Volcanic Hazards • Lava flows are the most famous yet the least dangerous of hazards.

  20. Volcanic Hazards • There are two kinds of lava flows: • Pahoehoe • `A`A

  21. I love Volcanoes!!!!!! • Although volcanoes are beautiful and wondrous things, they can be harmful and cause many disasters. It is better to love volcanoes from a far off distance.

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