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



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    9th Grade Chapter 2 Lesson 1 9th Grade Chapter 2 Lesson 1 Presentation Transcript

    • 9 th Grade Chapter 2 Lesson 1 Pgs. 23-27 For Student Use Only
    • 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
    • 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.)
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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