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AIM: SWBAT Describe the hydrological cycle and cite a good example of how humans have disrupted it

AIM: SWBAT Describe the hydrological cycle and cite a good example of how humans have disrupted it. Please Do Now: 1) Why are there more sardines than sharks in an ecosystem? 2) Why are the hydrological cycle, and other biogeochemical cycles, examples of closed systems?. Agenda. Do Now

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AIM: SWBAT Describe the hydrological cycle and cite a good example of how humans have disrupted it

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  1. AIM: SWBAT Describe the hydrological cycle and cite a good example of how humans have disrupted it Please Do Now: 1) Why are there more sardines than sharks in an ecosystem? 2) Why are the hydrological cycle, and other biogeochemical cycles, examples of closed systems?

  2. Agenda • Do Now • Hydrological Cycle Notes • “Quiz” • From Venn Diagrams to Cladograms

  3. Remember: Steps of the Hydrological Cycle • Evaporation • Transport • Condensation • Precipitation • Runoff • Infiltration • Storage

  4. Hydrological Cycle • There is a finite amount of water on the planet

  5. How do living things influence the hydrological cycle? Evaporation • When the water molecules absorb the sun’s energy, they go from a liquid state to a gaseous state • BIOLOGICAL INPUT: transpiration, the process by which plants take water up from the soil and it evaporates through its leaves, drastically increases the amount of evaporation happening on land

  6. How do living things influence the hydrological cycle? Condensation • When water vapor reaches a high enough part of the atmosphere, it cools down to a point where it is tiny drops of liquid again • BIOLOGICAL INPUT: often water droplets will not condense unless there is a little grain of pollen or a microbe floating in the air for it to start forming around

  7. Precipitation • When the water droplets in the clouds have gotten too big, they fall to earth as rain or snow

  8. What happens to water on the ground? • A number of things happens to recently precipitated water: • Gets tied up in a glacier or snow cap • Will run off into a lake or an ocean • Will enter the soil, become part of the ground water, called infiltration • Or it can enter the biosphere and become part of the tissue of living organisms

  9. What are Aquifers? • Aquifers are underground reservoirs of water • They are the result of infiltration • They take an extremely long time to fill up • We are pumping the water out of them way faster than the hydrological cycle can replenish it • Ex: ogallala aquifer, central valley of california

  10. Subsistence from aquifer depletion

  11. Why Does the Hydrological Cycle Matter? • The two abiotic factors that are most important in determining what can live in an environment are temperature and how much precipitation the area gets

  12. “Quiz” time • What you are going to do for your quiz grade this week is use the dichotomous key I have prepared and determine the identity of an unknown leaf species • It will be good practice for next week outdoors • Should be an easy 100% • All you need to do is write down all the steps you took through the key to arrive at your answer • Ex: question 1: no, question 2: no, question 4: yes, chart 8: northern red oak

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