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Introduction to water - PowerPoint PPT Presentation

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Introduction to water

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  1. Introduction to water

  2. What is the hydrological cycle? • It refers to the continuous movement of water from the Earth’s surface to the atmosphere and back again.

  3. SKETCHING AND ANNOTATION EXERCISE http://www.youtube.com/watch?v=0_c0ZzZfC8c

  4. Distribution of water

  5. http://media.economist.com/sites/default/files/cf_images/20080920/CIR935.gifhttp://media.economist.com/sites/default/files/cf_images/20080920/CIR935.gif

  6. What is water scarcity and why IS there water scarcity?

  7. Water “scarcity” SUPPLY • An economic principle • Where supply > demand. :. We have a water shortage/constraint. DEMAND

  8. How can there be water scarcity when 75% of the earth’s surface is made of water?

  9. Only 1 percent of total amount of water on earth is fresh water http://snr-1349.unl.edu/images/waterdist.gif

  10. Think: what are the factors affecting water supply and demand?