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9th Grade Chapter 2 Lesson 1


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9th Grade Chapter 2 Lesson 1

  1. 1. 9 th Grade Chapter 2 Lesson 1 Pgs. 23-27 For Student Use Only
  2. 2. Atmosphere <ul><li>Earth’s atmosphere can be considered an ocean of air </li></ul><ul><li>It is held in place by the gravitational pull of the earth </li></ul><ul><li>Air exerts pressure on the earth </li></ul><ul><ul><li>Atmospheric Pressure- the amount of pressure pushing on the earth- usually 17.7 pounds per square inch </li></ul></ul>
  3. 3. Atmosphere <ul><li>Composition of Air </li></ul><ul><ul><li>Nitrogen: 78% </li></ul></ul><ul><ul><li>Oxygen: 21% </li></ul></ul><ul><ul><li>Argon: 1% </li></ul></ul><ul><ul><li>Carbon Dioxide: .03% </li></ul></ul><ul><ul><li>Water Vapor: Up to 4% (depending on humidity and altitude) </li></ul></ul><ul><ul><li>Traces of Neon, Krypton, Xenon, and solid particles (ice, dust, etc.) </li></ul></ul>
  4. 4. Atmosphere <ul><li>Air </li></ul><ul><ul><li>Most gases in the atmosphere are extremely important. </li></ul></ul><ul><ul><ul><li>Oxygen- vital to human and animal life </li></ul></ul></ul><ul><ul><ul><li>Carbon Dioxide- help plants make oxygen </li></ul></ul></ul><ul><ul><ul><li>Carbon Dioxide and Water Vapor- help trap heat in the atmosphere and create our stable climate </li></ul></ul></ul>
  5. 5. Atmosphere <ul><li>Air </li></ul><ul><ul><li>Most gases in the atmosphere are extremely important. </li></ul></ul><ul><ul><ul><li>Water Vapor- creates snow, sleet, hail, dew, etc. </li></ul></ul></ul><ul><ul><ul><li>Nitrogen- important part of the food chain </li></ul></ul></ul><ul><ul><ul><li>Ozone (O 3 )- protects the earth from the UV rays from the sun </li></ul></ul></ul>
  6. 6. Atmosphere <ul><li>Atmosphere Composition </li></ul><ul><ul><li>Homosphere- (Lower atmosphere- surface to 50mi)- composed of an even mixture of gases we breathe and has a constant chemical composition </li></ul></ul><ul><ul><li>Heterosphere- (Upper atmosphere- 50mi and upward)- composed of different gases with one gas being predominate- several layers of different gasses </li></ul></ul>
  7. 7. Atmosphere <ul><li>Atmosphere’s Layers </li></ul><ul><ul><li>Troposphere- lowest layer of the atmosphere, this is where weather happens </li></ul></ul><ul><ul><li>Stratosphere-strong, steady winds, but few changes in the weather, the jet-stream is found here </li></ul></ul>
  8. 8. Atmosphere <ul><li>Atmosphere’s Layers </li></ul><ul><ul><li>Ozone Layer- Lies in the upper stratosphere, helps protect people, animals, and plants from harmful UV radiation </li></ul></ul><ul><ul><ul><li>UVC- most harmful, completely absorbed </li></ul></ul></ul><ul><ul><ul><li>UVB- causes sunburn and tanning, partially absorbed </li></ul></ul></ul><ul><ul><ul><li>UVA- least powerful- pass through the ozone layer </li></ul></ul></ul><ul><ul><li>Here O 2 absorbs UVC energy and breaks apart it recombines to form O 3 </li></ul></ul>
  9. 9. Atmosphere <ul><li>Atmosphere’s Layers </li></ul><ul><ul><li>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 </li></ul></ul>