Ch 15 sec 1

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Ch 15 sec 1

  1. 1. The Atmosphere <ul><li>Atmosphere- mixture of gases that surround the Earth </li></ul><ul><li>3 physical states of water in the atmosphere: </li></ul><ul><li>liquid- rain </li></ul><ul><li>Soild- snow or ice </li></ul><ul><li>Gas- water vapor </li></ul>
  2. 2. <ul><li>Describe the 3 physical states of water in the atmosphere. </li></ul>
  3. 3. <ul><li>Water can be liquid (rain), solid (snow or ice), or gas (water vapor) </li></ul>
  4. 4. The composition of the Atmosphere
  5. 5. As altitude increases, air pressure decreases <ul><li>Air pressure- the measure of the force with which air molecules push on a surface </li></ul>
  6. 6. Atmospheric Composition affects air temperature <ul><li>Some parts of the atmosphere are warmer because they contain a high percentage of gases that absorb solar energy. </li></ul><ul><li>Other parts of the atmosphere contain less gases and are cooler. </li></ul>
  7. 7. Layers of the atmosphere <ul><li>Temperature of the </li></ul><ul><li>layers vary because </li></ul><ul><li>of the composition </li></ul><ul><li>of gases in each </li></ul><ul><li>layer. </li></ul>
  8. 8. Troposphere: Layer in which we live tropo- “turning” or “change” <ul><li>Contains almost 90% of the atmosphere’s total mass hence it is the densest layer </li></ul><ul><li>Presence of carbon dioxide, water vapor, clouds, air pollution, weather and life-forms </li></ul><ul><li>As altitude increases, temperature decreases </li></ul>
  9. 9. Stratosphere: Home of the ozone layer <ul><li>Very thin air and less moisture </li></ul><ul><li>As altitude increases, temperature rises because of the ozone layer that absorbs ultraviolet radiation from the sun which warms the air </li></ul><ul><li>OZONE LAYER- protects life on earth by absorbing harmful rays from the sun </li></ul>
  10. 10. Mesosphere: The middle layer <ul><li>Coldest layer </li></ul><ul><li>Temperature decreases as altitude increases </li></ul>
  11. 11. Thermosphere: The edge of the atmosphere <ul><li>Temperature increases with altitude </li></ul><ul><li>Nitrogen and oxygen atoms absorb high- energy solar radiation and release thermal energy which causes temperature to be 1,000 degrees Celsius </li></ul>
  12. 12. <ul><li>Why doesn’t the thermosphere feel hot? </li></ul>
  13. 13. <ul><li>The thermosphere does not feel hot because air molecules are spaced far apart and cannot collide to transfer much thermal energy. </li></ul>
  14. 14. Ionosphere: Home of the Auroras <ul><li>Located in the upper mesosphere and lower thermosphere </li></ul><ul><li>Reflects AM radio waves </li></ul>
  15. 15. <ul><li>Ions- electrically charged particles formed as a result in a temperature rise in the thermosphere caused by the nitrogen and oxygen atoms absorbing solar energy </li></ul>
  16. 16. <ul><li>Auroras- shimmering lights in the polar regions resulting from ions radiating energy </li></ul>

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