Freshwater

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Freshwater

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

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