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  • 1. Chapter 5: Lesson 3: How do volcanoes shape the land?
  • 2. Openings in earth’s crust.
  • 3. Volcanoes are located on certain places on earth’s surface. (Found where tectonic plates meet)
  • 4. A circle of volcanoes (Ring of fire) follows the boundaries of plates that meet along the pacific ocean.
  • 5. Eruption Outpouring of ash, gases, lava or a combination of these.
  • 6. Inside a volcano Smoke and ashes Crater Vent Lava Vent Magma chamber
  • 7. Crater (cup shaped depression)
  • 8. Volcanoes erupt where one plate is pushed under another.
  • 9. Caldera The hole that is formed when the chamber under the volcano is emptied and the volcano collapses.
  • 10. Underground magma formations 1) Dike (Formed when magma hardens in vertical or nearly vertical cracks)
  • 11. 2) Sill (Formed when magma hardens in horizontal layers of rock)
  • 12. 3) Laccolith (A dome shape formed when magma is pushed into a sill and doesn’t spread) When a laccolith is formed it may push the layers of rock above it.
  • 13. 4) Batholith (Huge, irregular shape deep in the earth’s crust)
  • 14. Types of volcanoes Active volcanoes Dormant Extinct volcanoes volcanoes (Currently erupting or (Stopped recently erupted) (Does not erupt erupting) for some time) Shield volcanoes Cinder- Composite cone volcanoes volcanoes
  • 15. 1) Shield volcanoes Built by thinner, fluid lava that spreads over a large area. (Broad base and gently sloping sides)
  • 16. 2) Cinder-cone volcanoes Formed by thick lava that is thrown high up in the air and fall as chunks or cinders. (Form as cone shape with narrow base and steep sides)
  • 17. 3) Composite volcanoes Built by layers of ash and cinders sandwiched between layers of hardened lava. (Both sides of a composite volcano look the same)
  • 18. Active volcano not on boundary
  • 19. Hot spot (A stationary pool of magma) The Hawaiian islands are form an island chain. The origin of the Hawaiian island volcanoes is the hot spot.
  • 20. Island arc (Formed in areas where an ocean floor plate is pushed under another ocean floor plate.)