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Weather and atmosphere

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Weather and atmosphere

  1. 1. Weather and the Atmosphere
  2. 2. Important Facts <ul><li>Earth’s atmosphere is the thin layer of gases that surrounds Earth. </li></ul><ul><li>Dry air is 78% nitrogen and 21% oxygen. </li></ul><ul><li>Factories produce less air pollution than motor vehicles. </li></ul>
  3. 3. More Facts <ul><li>Burning fossil fuels causes more pollution than soil erosion, dust storms, and forest fires together. </li></ul><ul><li>Nitrogen oxides react with other air pollutants in the presence of sunlight to form photochemical smog. </li></ul><ul><li>As altitude decreases, the density of the air increases . </li></ul>
  4. 4. Facts Continued <ul><li>As air pressure increases, the column of mercury in a barometer rises. </li></ul><ul><li>People live in the troposphere , or inner layer of the atmosphere. </li></ul><ul><li>The lowest temperatures in the atmosphere are found in the mesosphere. </li></ul>
  5. 5. Let’s See If You Were Paying Attention
  6. 6. The two most abundant gases in the atmosphere are <ul><li>A. carbon dioxide and oxygen </li></ul><ul><li>B. carbon dioxide and nitrogen </li></ul><ul><li>C. nitrogen and oxygen </li></ul><ul><li>D. nitrogen and hydrogen </li></ul><ul><li>The Answer is </li></ul><ul><li>C </li></ul>
  7. 7. When climbing a high mountain, you get out of breath easily because <ul><li>A. the percentage of oxygen in the air decreases </li></ul><ul><li>B. the air is more dense </li></ul><ul><li>C. there is less oxygen in each cubic meter of air </li></ul><ul><li>D. air pressure is greater </li></ul><ul><li>The Answer is </li></ul><ul><li>C </li></ul>
  8. 8. Instruments used to measure air pressure are called <ul><li>A. Thermometers </li></ul><ul><li>B. Hygrometers </li></ul><ul><li>C. Hydrometers </li></ul><ul><li>D. Barometers </li></ul><ul><li>The Answer is </li></ul><ul><li>D </li></ul>
  9. 9. The layer in our atmosphere in which weather occurs is the <ul><li>A. troposphere </li></ul><ul><li>B. stratosphere </li></ul><ul><li>C. mesosphere </li></ul><ul><li>D. exosphere </li></ul><ul><li>The Answer is </li></ul><ul><li>A </li></ul>
  10. 10. The atmosphere is <ul><li>A. the layer in which weather occurs </li></ul><ul><li>B. the layer that contains the ozone layer </li></ul><ul><li>C. the layer of water in the oceans </li></ul><ul><li>D. the layer of gases that surrounds Earth </li></ul><ul><li>The Answer is </li></ul><ul><li>D </li></ul>
  11. 11. The human activity that causes the most air pollution is the burning of _________ <ul><li>The Answer is </li></ul><ul><li>Fossil fuels </li></ul>
  12. 12. Let’s Keep Learning!
  13. 13. Earth’s atmosphere is important because… <ul><li>it provides all the gases needed for living things </li></ul><ul><li>traps energy from the sun, which allows water to exist as a liquid </li></ul><ul><li>. </li></ul>
  14. 14. Air in the atmosphere <ul><li>has pressure because air has mass </li></ul><ul><li>contains particles </li></ul>
  15. 15. From Earth to space, the main layers in our atmosphere are: Troposphere Stratosphere Mesosphere Thermosphere
  16. 16. Acid Rain and the Ozone <ul><li>Acid rain forms when water combines with sulfur oxides </li></ul><ul><li>The ozone layer in the stratosphere absorbs ultraviolet radiation </li></ul>
  17. 17. Aneroid versus Mercury Barometer <ul><li>An aneroid barometer is different from a mercury barometer in that it does not contain a liquid </li></ul>
  18. 18. Let’s Test Our Knowledge
  19. 19. Ozone is <ul><li>A. a form of oxygen with three oxygen atoms in each molecule </li></ul><ul><li>B. a form of nitrogen with three oxygen atoms in each molecule </li></ul><ul><li>C. a form of oxygen with two oxygen atoms in each molecule </li></ul><ul><li>D. A form of nitrogen with two oxygen atoms in each molecule </li></ul><ul><li>The Answer is </li></ul><ul><li>A </li></ul>
  20. 20. Water vapor is water in the form of <ul><li>A. steam </li></ul><ul><li>B. crystals </li></ul><ul><li>C. a gas </li></ul><ul><li>D. droplets </li></ul><ul><li>The Answer is </li></ul><ul><li>C </li></ul>
  21. 21. Smoke is dark in color because it consists mainly of <ul><li>A. carbon dioxide </li></ul><ul><li>B. dust </li></ul><ul><li>C. water vapor </li></ul><ul><li>D. carbon </li></ul><ul><li>The Answer is </li></ul><ul><li>D </li></ul>
  22. 22. Density can be determined using <ul><li>A. density = mass/volume </li></ul><ul><li>B. density = volume/mass </li></ul><ul><li>C. density = mass * volume </li></ul><ul><li>D. density = mass + volume </li></ul><ul><li>The Answer is </li></ul><ul><li>A </li></ul>
  23. 23. The condition of Earth’s atmosphere at a particular time and place is known as __________ <ul><li>The Answer is </li></ul><ul><li>weather </li></ul>
  24. 24. The atmospheric gas called _______ forms clouds when it condenses. <ul><li>The Answer is </li></ul><ul><li>Water vapor </li></ul>
  25. 25. Acid rain can form when _______ in the air mixes with sulfur oxides to form sulfuric acid. <ul><li>The Answer is </li></ul><ul><li>Water </li></ul>
  26. 26. A(n) ________ barometer measures air pressure by using a metal chamber that is sensitive to pressure changes. <ul><li>The Answer is </li></ul><ul><li>Aneroid </li></ul>
  27. 27. Great Job!
  28. 28. Resources <ul><li>Clip Art (Microsoft PowerPoint 2003) </li></ul><ul><ul><li>Images and effects </li></ul></ul><ul><li>Science Explorer Weather and Climate (Prentice Hall science explorer). (2000). Upper Saddle River, New Jersey: Pearson Prentice Hall. </li></ul>