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9th Grade Chapter 2 Lesson 1
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9th Grade Chapter 2 Lesson 1


For Student Use Only

For Student Use Only

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  • 1. 9 th Grade Chapter 2 Lesson 1 Pgs. 23-27 For Student Use Only
  • 2. Atmosphere
    • Earth’s atmosphere can be considered an ocean of air
    • It is held in place by the gravitational pull of the earth
    • Air exerts pressure on the earth
      • Atmospheric Pressure- the amount of pressure pushing on the earth- usually 17.7 pounds per square inch
  • 3. Atmosphere
    • Composition of Air
      • Nitrogen: 78%
      • Oxygen: 21%
      • Argon: 1%
      • Carbon Dioxide: .03%
      • Water Vapor: Up to 4% (depending on humidity and altitude)
      • Traces of Neon, Krypton, Xenon, and solid particles (ice, dust, etc.)
  • 4. Atmosphere
    • Air
      • Most gases in the atmosphere are extremely important.
        • Oxygen- vital to human and animal life
        • Carbon Dioxide- help plants make oxygen
        • Carbon Dioxide and Water Vapor- help trap heat in the atmosphere and create our stable climate
  • 5. Atmosphere
    • Air
      • Most gases in the atmosphere are extremely important.
        • Water Vapor- creates snow, sleet, hail, dew, etc.
        • Nitrogen- important part of the food chain
        • Ozone (O 3 )- protects the earth from the UV rays from the sun
  • 6. Atmosphere
    • Atmosphere Composition
      • Homosphere- (Lower atmosphere- surface to 50mi)- composed of an even mixture of gases we breathe and has a constant chemical composition
      • Heterosphere- (Upper atmosphere- 50mi and upward)- composed of different gases with one gas being predominate- several layers of different gasses
  • 7. Atmosphere
    • Atmosphere’s Layers
      • Troposphere- lowest layer of the atmosphere, this is where weather happens
      • Stratosphere-strong, steady winds, but few changes in the weather, the jet-stream is found here
  • 8. Atmosphere
    • Atmosphere’s Layers
      • Ozone Layer- Lies in the upper stratosphere, helps protect people, animals, and plants from harmful UV radiation
        • UVC- most harmful, completely absorbed
        • UVB- causes sunburn and tanning, partially absorbed
        • UVA- least powerful- pass through the ozone layer
      • Here O 2 absorbs UVC energy and breaks apart it recombines to form O 3
  • 9. Atmosphere
    • Atmosphere’s Layers
      • Mesosphere- the middle layer, contains the Mesopause which is the coldest part of the atmosphere, also planes cannot fly here because air is so thin