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Freshwater
 

Freshwater

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    Freshwater Freshwater Presentation Transcript

    • Earth’s Water
    • 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.
    • What is the hydrologic cycle?
      • the movement and storage of water in the hydrosphere
      • http://www.epa.gov/safewater/kids/flash/flash_watercycle.html
    • How does water move through the cycle?
      • Evaporation (includes transpiration)
      • Condensation
      • Precipitation
      • Collection/
      • storage
    •  
    • 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
    • What causes condensation?
      • Water vapor releases heat energy.
      • Water vapor molecules change from a gas state to a liquid state.
    • What causes precipitation?
      • Gravity!
    • How is water collected?
      • Surface Water
      • river systems (watersheds)
      • oceans
      • runoff
      • Groundwater
      • infiltration/percolation
      • aquifers
      • can discharge to surface water
    • What is groundwater? permeable –allows water to pass through pores in zone of aeration water table – must drill below for water Impermeable - bedrock