2. http://eo.ucar.edu/basics/images/usgs_water_cycle.jpg

3. Key Terms Water Cycle- movement of water through space and time. –Powered by the SUN and Gravity Evaporation- water turning into vapor or steam from the suns energy Transpiration- moisture released from vegetation Condensation- mixing of dust particles and temperature to form clouds Precipitation- rain, snow, sleet, hail, etc.

4. Additional Terms Runoff- water that is not absorbed into the ground Groundwater- water that is stored below the Earth’s surface Erosion- the weathering (breakdown) of the Earth’s surface Sedimentation- deposits left behind from erosion

6. Water on Earth Oceans97.2% All Icecaps/glaciers2.0% Groundwater0.62% Freshwater Lakes0.009% Inland Seas/Salt Lakes0.001% Atmosphere0.001% All Rivers0.0001% Total99.8381%

7. Troubled Waters Today- 40% of US waterways are unsafe for swimming or fishing. 221.8 million pounds of toxic chemicals into our waterways USGS- pesticides in streams and groundwater In 2004, 31 states had statewide fish consumption advisories in place because of toxic pollution At least 853 billion gallons of raw sewage are dumped into US waterways U.S. PIRG, Troubled Waters: An Analysis of Clean Water Act Compliance, 2006

9. Key Terms Water Cycle Evaporation Transpiration Condensation Precipitation Runoff Groundwater Erosion Sedimentation