Section 1 Notes

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<ul><li> 1. Earths Atmosphere<br />Chapter 1: Section 1<br /></li></ul> <p> 2. Importance of the Atmosphere<br />Earths 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. Importance of the Atmosphere<br />Earths 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. Importance of the Atmosphere<br />Earths atmosphere also protects us from the Suns harmful rays.<br /> 5. Makeup of the Atmosphere<br />Earths atmosphere is a mixture of gases, solids, and liquids that surrounds the planet.<br />It extends from Earths 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. 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. 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. The Lower Layers - Stratosphere<br />The stratosphere extends from about 10km above the Earths surface to 50 km.<br />Contains the ozone layer, which protects us from the Suns harmful rays.<br /> 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. The Upper Layers - Thermosphere<br />Named for its high temperatures.<br />Its the thickest atmospheric layer and is found between 85km and 500km above Earths surface.<br />Auroras occur in the thermosphere.<br /> 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. 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. 14. Gravity<br /> 15. Temperature in Atmospheric Layers<br /> 16. 17. The Ozone Layer<br /> 18. Ozone Destruction<br /></p>