Freshwater
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Freshwater

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Freshwater Presentation Transcript

  • 1. Earth’s Water
  • 2. How is water distributed on Earth?
    • remains fairly constant
    • 97% is saltwater – unusable
    • most freshwater (69%) is ice – polar ice caps, glaciers, etc.
    • 30% of freshwater is groundwater
    • .3% (of the 3%... that is .09% of all water) is surface water
    • You are drinking water that dinosaurs could have swam in, drank, etc.
  • 3. What is the hydrologic cycle?
    • the movement and storage of water in the hydrosphere
    • http://www.epa.gov/safewater/kids/flash/flash_watercycle.html
  • 4. How does water move through the cycle?
    • Evaporation (includes transpiration)
    • Condensation
    • Precipitation
    • Collection/
    • storage
  • 5.  
  • 6. How does water evaporate?
    • Solar energy adds heat energy.
    • Water molecules absorb heat energy.
    • Heat energy speeds up the molecules.
    • Water changes from a liquid state into a gas state (vapor).
        • sweat
    • transpiration
  • 7. What causes condensation?
    • Water vapor releases heat energy.
    • Water vapor molecules change from a gas state to a liquid state.
  • 8. What causes precipitation?
    • Gravity!
  • 9. How is water collected?
    • Surface Water
    • river systems (watersheds)
    • oceans
    • runoff
    • Groundwater
    • infiltration/percolation
    • aquifers
    • can discharge to surface water
  • 10. What is groundwater? permeable –allows water to pass through pores in zone of aeration water table – must drill below for water Impermeable - bedrock