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Chapter 6

Chapter 6. The Earth. Our Earth is a very special place. Seeds Of Life. Liquid Water. Not too hot, not too cold!. The Earth’s atmosphere has evolved over billions of years. First atmosphere: hydrogen and helium Second atmosphere: 98% carbon dioxide

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Chapter 6

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  1. Chapter 6 The Earth

  2. Our Earth is a very special place.

  3. Seeds Of Life

  4. Liquid Water

  5. Not too hot, not too cold!

  6. The Earth’s atmosphere has evolved over billions of years • First atmosphere: hydrogen and helium • Second atmosphere:98% carbon dioxide 2% water, ammonia, methane, and nitrogen • Current atmosphere:78% nitrogen and 21% oxygen

  7. Figure 5.16

  8. Cyanobacteria

  9. Ozone Layer • Ozone is O3 • Formed before early life could move from the oceans onto dry land • Protects the surface from hazardous UV radiation from the Sun

  10. Chlorofluorocarbons (CFC’s) • Our Ozone is destroyed by these chemicals • They are very efficient at removing ozone • Ozone slowly replenishes itself as it is created from sunlight and lightning

  11. The Earth’s magnetic field shield us from the stream of charged particles from the Sun called the solar wind

  12. Aurorae

  13. Earth’s interior consists of a rocky mantle and an iron rich core

  14. Differentiation

  15. Collision of two plates forms mountains separation Earth’s surface is composed of about 12 major plates which slowly move relative to one another

  16. Plate tectonics is driven by convective currents in Earth’s mantle

  17. Plate tectonics produced major changes to the Earth’s surface over the past 200 million years

  18. Earth in the Future

  19. What would it be like to live in Pangaea? • Do you think we can learn to get along? • How would it affect: politics/government travel/vacationing animal migration population country boundaries import/export

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