Section 1 Notes


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Section 1 Notes

  1. 1. Earth’s Atmosphere<br />Chapter 1: Section 1<br />
  2. 2. Importance of the Atmosphere<br />Earth’s atmosphere is a thin layer of air that forms a protective covering around the planet.<br />If Earth had no atmosphere, then days would be extremely hot and nights would be extremely cold.<br />
  3. 3. Importance of the Atmosphere<br />Earth’s atmosphere maintains a balance between the amount of heat absorbed from the Sun and the amount of heat that escapes back into space.<br />Heat absorbed from Sun<br />Heat escaped from Earth<br />Atmosphere<br />
  4. 4. Importance of the Atmosphere<br />Earth’s atmosphere also protects us from the Sun’s harmful rays.<br />
  5. 5. Makeup of the Atmosphere<br />Earth’s atmosphere is a mixture of gases, solids, and liquids that surrounds the planet.<br />It extends from Earth’s surface into outer space.<br />Gases – Nitrogen (78%), Oxygen (21%), Other Gases (1%)<br />Solids – Dust (wind picks up from ground), Salt (ocean spray), Pollen (plants)<br />Liquid Droplets (water and volcanic materials)<br />
  6. 6. Layers of the Atmosphere<br />There are five layers of the atmosphere.<br />The lower layers include the troposphere and stratosphere.<br />The upper atmospheric layers include the mesosphere, thermosphere, and exosphere.<br />
  7. 7. The Lower Layers - Troposphere<br />We live within the troposphere. It is the lowest layer of the atmosphere.<br />It contains 99% of the water vapor and 75% of the atmospheric gases.<br />Rain, snow, and clouds occur in the troposphere.<br />
  8. 8. The Lower Layers - Stratosphere<br />The stratosphere extends from about 10km above the Earth’s surface to 50 km.<br />Contains the ozone layer, which protects us from the Sun’s harmful rays.<br />
  9. 9. The Upper Layers - Mesosphere<br />Extends from the top of the stratosphere to 85km above Earth.<br />Shooting stars are meteors in the mesosphere.<br />The frigid temperatures in the upper mesosphere create noctilucent clouds – clouds of ice crystals.<br />
  10. 10. The Upper Layers - Thermosphere<br />Named for its high temperatures.<br />It’s the thickest atmospheric layer and is found between 85km and 500km above Earth’s surface.<br />Auroras occur in the thermosphere.<br />
  11. 11. The Upper Layers - Ionosphere<br />Within the mesosphere and thermosphere is a layer of electronically charged particles called the ionosphere.<br />It allows radio waves to travel across the country to another city.<br />
  12. 12. The Upper Layers - Exosphere<br />The outer most layer of the atmosphere.<br />Space shuttles and satellites orbit the Earth in the exosphere.<br />
  13. 13.
  14. 14. Gravity<br />
  15. 15. Temperature in Atmospheric Layers<br />
  16. 16.
  17. 17. The Ozone Layer<br />
  18. 18. Ozone Destruction<br />