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14. atmosphere notes

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  • 1. ATMOSPHERE: Layer of gases that surround the Earth
  • 2. COMPOSITION: 78% Nitrogen 21% Oxygen .9% Argon .1% Other Gases
  • 3. ATMOSPHERIC PARTICLES: • Water Vapor – from evaporation and transpiration, ranges from 1% (dry) to 4% (moist) • Ozone – O3, absorbs harmful UV radiation, being destroyed by particulates • Particulates – tiny solid particles such as ash, dust, pollen, microscopic organisms
  • 4. ATMOSPHERIC PRESSURE: • The pressure exerted on a surface by the atmosphere • Decreases as altitude increases • Measured using a barometer
  • 5. LAYERS OF THE ATMOSPHERE: a) Troposphere b) Stratosphere c) Mesosphere d) Thermosphere
  • 6. TROPOSPHERE: • Closest layer to the Earth • Where the weather is found • Temperature decreases as altitude increases because its heated by Earth’s surface
  • 7. STRATOSPHERE: • Almost all the ozone (including ozone layer) in this layer • As altitude increases temperature increases because UV rays absorbed by ozone
  • 8. MESOSPHERE: • Temperature decreases as altitude increases • Coldest layer
  • 9. THERMOSPHERE: • As altitude increases temperature increases because oxygen and nitrogen atoms absorb solar radiation