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PLEASE READ

PLEASE READ. On many days, when you come into class, there will be a DAILY QUESTION on the board or screen.

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PLEASE READ

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  1. PLEASE READ • On many days, when you come into class, there will be a DAILY QUESTION on the board or screen. • If there is a DQ, get out a piece of lined, hole-punched paper and begin writing a response. Put your name on the paper and date the response. No need to rewrite the question. 5 minutes or less • Start a new response right below where the last one ended. I will collect DQs periodically.

  2. DAILY QUESTION • Give a specific example of The Tragedy of the Commons and explain how it has come about. • Do not repeat examples we’ve used in class, and be specific—no ``wood in the rainforest.’’

  3. Freshwater resources: use and conservation

  4. Where is the water?

  5. http://ga.water.usgs.gov/edu/watercycle.html

  6. Hydrologic cycle • Water you drink today may have been part of a dinosaur’s urine 75 million years ago. • OR, in the Passaic River 4 months ago •  residence times • Range from days in the atmosphere to thousands of years deep in the ground

  7. Rivers • Rivers have a beginning: SOURCE • And an end: MOUTH • Little rivers that feed into bigger rivers (and make them bigger) are TRIBUTARIES Main river tributary

  8. Lakes • Non-flowing surface water • Numerous zones:

  9. Watershed • Warning: sometimes confusing • Watershed is the area of land drained by a river and its tributaries • What Is A Watershed?

  10. Groundwater • Not ``an underground lake’’ • Most groundwater is in aquifers. • Water in the pore spaces of rock, sand, or gravel.

  11. Aquifers • Recharge zone • Area of the Earth’s surface where water percolates down into (infiltrates) the Earth and resupplies the aquifer. • Why is a recharge zone important? • How would you measure the rate of an aquifer’s depletion? (can you state a simple word equation)? • What might influence the rate of recharge?

  12. How do we use water? • Consumptive use: water removed from aquifer or surface is not returned directly to that body. • Nonconsumptive use: water is not removed, or is only temporarily removed from the source

  13. Uses of water • What do you think are the major uses of water in the United States? • In other words, how do we use the water that is withdrawn from aquifers, rivers, and lakes?

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