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Chapter 7: Lesson 3

Chapter 7: Lesson 3. VOLCANOES. Pages D30 and D31. How do Volcanoes Form?. What is a Volcano?. A place where molten rock, hot gases, and solid rock erupt It is an opening in the crust.

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Chapter 7: Lesson 3

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  1. Chapter 7: Lesson 3 VOLCANOES

  2. Pages D30 and D31 How do Volcanoes Form?

  3. What is a Volcano? • A place where molten rock, hot gases, and solid rock erupt • It is an opening in the crust

  4. Vent: central opening in a volcanic area through which magma may escape • Lava: magma that comes out of the vent • Erupted material cools and hardens around the vent. This is a volcano!

  5. Crater: a cup-like hollow that forms at the top of a volcano and around the vent.

  6. Volcano collapses and causes a larger craterCALDERA

  7. Volcanoes occur in belts, or long lines... • Pacific Ring of Fire • Circles the Pacific Ocean

  8. Another is located around the Mediterranean Sea through Iran and continues through Indonesia to the Pacific

  9. 80% of land volcanoes are found on these two belts • On the ocean floor, volcanoes line the mid-ocean ridges. • Volcanoes form around boundaries

  10. Rift volcanoes: Form at divergent boundaries

  11. Hawaiian Islands • Hot Spot: a hot part of the mantle. Magma melts up through the crust. Middle of the plate is moving over a hot spots

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