Earth’S Cycles

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Earth’S Cycles

  1. 1. Earth’s Cycles Students will be able to Analyze each cycle and state its importance
  2. 2. Water Cycle <ul><li>Describes the continuous </li></ul><ul><li>movement of water on Earth </li></ul><ul><li>Repeating Cycle (4 steps) </li></ul><ul><li>1. Evaporation – Water leaves the surface </li></ul><ul><li>Mostly the ocean surface </li></ul><ul><li>Lakes/streams/snow melt… </li></ul><ul><li>Plants/animals </li></ul>
  3. 3. Water Cycle <ul><li>2. Condensation </li></ul><ul><li>Water gas cools to form liquid (cloud) </li></ul><ul><li>3. Precipitation </li></ul><ul><li>Water starts to fall back to Earth </li></ul><ul><li>Rain, snow, sleet, hail… </li></ul><ul><li>4. Run off </li></ul><ul><li>Water returns to ocean </li></ul><ul><li>*Most water is found in the ocean* </li></ul>
  4. 5. Rain Shadow <ul><li>Caused by wind direction and </li></ul><ul><li>mountain ranges </li></ul><ul><li>Explains Denver’s dry climate </li></ul>
  5. 6. Global Weather
  6. 7. Carbon Cycle <ul><li>1. Carbon taken from air by plants </li></ul><ul><li>Used for growth to make sugars </li></ul><ul><li>Most is used by small ocean plants (plankton) </li></ul><ul><li>2. Carbon released into air </li></ul><ul><li>Animals digest sugars and release carbon to air </li></ul><ul><li>Decomposers release carbon </li></ul><ul><li>Burning of plant material (wood, gasoline…) </li></ul><ul><li>Volcanic activity </li></ul><ul><li>*Most carbon is found in Earth plants/soil/ocean* </li></ul>
  7. 9. Carbon Cycle
  8. 10. Carbon Cycle Effect <ul><li>Green House Effect </li></ul><ul><li>Water, CO 2 , other gases trap heat </li></ul><ul><li>Required to prevent water from freezing </li></ul>
  9. 12. Carbon Cycle Problem <ul><li>Global Warming </li></ul><ul><li>Overheating from increased CO 2 </li></ul><ul><li>Concern is that rising ocean temp will change entire world climate </li></ul><ul><li>Some places wetter, some drier </li></ul><ul><li>Melting glacier = rising sea level </li></ul>
  10. 13. Nitrogen Cycle <ul><li>Special bacteria in soil trap </li></ul><ul><li>nitrogen in soil </li></ul><ul><li>“ Nitrogen Fixation” </li></ul><ul><li>- Key chemical needed to make DNA </li></ul><ul><li>- Also key component in explosives </li></ul><ul><li>Decomposers release nitrogen back to air </li></ul><ul><li>*Most Nitrogen is found in atmosphere* </li></ul>
  11. 16. Poor Nitrogen Soils <ul><li>Carnivorous plants </li></ul><ul><li>Digest insects for nitrogen </li></ul>
  12. 17. Ozone Layer <ul><li>Ozone blocks UV light </li></ul><ul><li>Scientist noticed thinning </li></ul><ul><li>Linked to chlorofluorocarbons (CFC) </li></ul>
  13. 18. CFC Ban Effect
  14. 19. Quiz
  15. 20. Homework <ul><li>Pick an Earth cycle and describe how it works. List where the main source would be found in that cycle. </li></ul>

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