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Earth's Layers Presentation

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Insight School of Wisconsin Earth Science Lesson: Earth's Layers

Insight School of Wisconsin Earth Science Lesson: Earth's Layers

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  • 1. Earth Science Sept.14 th , 2010 Mrs. Harris
  • 2. Today’s objectives…
    • Journey to the center of the Earth!
      • Looking at Earth’s interior structure
      • Compositional view & Structural view
  • 3.
    • Take a guess at how many miles it is to the center of the Earth.
  • 4.
    • Take a guess at how many miles it is to the center of the Earth.
    • 20,856,000 feet (5,280 feet per mile)
  • 5.
    • Take a guess at how many miles it is to the center of the Earth.
    • 20,856,000 feet (5,280 feet per mile)
    • 3,950- 3,963 miles (closer at the poles)
  • 6.  
  • 7. Compositional Layers ( what it is made of )
    • Crust
    • Mantle
    • Core
  • 8. The Crust
    • Outer layer
    • 5-100 km thick
      • 3-62 miles
    • 2 types of crust
      • Oceanic (very dense, made of basalt)
      • Continental (less dense, made of granite)
  • 9.
    • What type of rock is the oceanic crust?
  • 10. Oceanic and Continental Crust
  • 11. The Mantle
    • Middle layer
    • Very thick layer
    • Moves by convection
      • ( think lava lamp)
  • 12. The Core
    • Made mostly of iron
    • Liquid outer, solid inner
    • 1/3 of the earth’s mass
    • Very hot
  • 13. Earth’s Layers
    • How are the earth’s layers similar to an egg?
    • Shell
    • Egg white
    • Yolk
  • 14. Structural Layers (mechanical)
    • Lithosphere - rigid outer layer
      • Crust and upper mantle (rigid part)
  • 15. Structural Layers
    • Asthenosphere - solid rock that flows slowly (like hot asphalt)
      • Plastic-like part of the mantle
      • The convection part
  • 16. Structural Layers
    • Mesosphere - middle layer (solid)
  • 17.  
  • 18. Structural Layers
    • Core
      • Outer core is dense, liquid iron and other metals
      • Inner core is dense, solid iron
  • 19. 2-1 Self check VERY handy
  • 20.  
  • 21. Next Class…
    • Earth’s spheres and energy budget
    • Cycling of matter