1. By Catherine Roda
EDU 270 11:00-12:15

2. Four Stages of the Water Cycle
Condensation
Precipitation
Evaporation
Ground Water
http://pathstoknowledge.net/2009/07/13/boiling-water-contributes-to-greenhouse-effect/

3. Evaporation
 Water changes states from a liquid to a gas
 Becomes known as water vapor
 Responsible for nearly 90% of atmospheric moisture
http://www.groundwater.org/kc/gwwatercycle.html

4. Evaporation
 Heat energy is needed to cause this change
 Evaporates easily at boiling temperature
 Water can evaporate at lower temperatures
http://pugetsoundblogs.com/forecasting-kitsap/2009/06/page/2/

5. Evaporation
 Evaporation is the main thing that drives the water
cycle
 Is also useful. People take advantage of evaporation for
the gathering of salt
http://www.seasaltsuperstore.com/salt-history.aspx

6. Condensation
 Water vapor turns back into a liquid
 Condensation is the exact opposite of evaporation
http://310waterdeepbelowscienceonline.blogspot.com/2010/07/second-step-of-cycle-condensation.html

7. Condensation
 This condensation occurring in the atmosphere
creates clouds
 Occurring at ground level causes fog and water
droplets on the outside of glasses/windows
http://www.crh.noaa.gov/jkl/?n=fog_types http://photovalet.com/332820

8. Condensation
 Droplets in the air attach to particles of dust, salt, and
smoke
 This gathering forms visible clouds
http://www.computerworlduk.com/in-depth/cloud-computing/3247745/why-cloud-wont-kill-it-outsourcing-or-consulting/

9. Precipitation
 Precipitation is water after its released from clouds
 Primary way atmospheric water returns to earth
http://somecontrast.wordpress.com/2008/05/19/rain-on-demand/

10. Precipitation
 Tiny water droplets must condense and collide with
other droplets and particles
 When enough of them join together, they fall from the
cloud
http://graphicleftovers.com/graphic/falling-water-drops-background/

11. Precipitation
 Most common form of precipitation is rain
 Depending on temperature, can also fall as freezing
rain, snow, sleet, or hail
http://en.loadtr.com/soft_animated_falling_snow-425083.htm

12. Precipitation: Acid Rain
 Acid rain is rain that contains high levels of nitric and
sulfuric acid
 Caused by volcano ash, but also exhaust and smoke
emissions from fossil fuels
 Smoke particles bind with condensing water within clouds
 Acid rain can damage bodies of water, soil, plants, even air
breathability
http://www.cacegypt.org/is_khattab/is/portfolio/drop_box/palmer_webfolio/wpalmer/palmer.htm

13. Ground Water
 After precipitation, water flows and moves over land
 Gathers in many different places
http://www.istockphoto.com/stock-photo-160375-flowing-water.php

14. Ground Water
 Much of the water ends up in lakes, rivers, etc.
 Some soaks into the soil and is then taken in by plant
roots
http://www.coastalliving.com/travel/great-lakes/pictured-rocks-national-lakeshore-00400000000828/page6.html

15. Ground Water
 Some water ends up in the water table or in aquifers
 These are underground areas of soil, rocks, and sand
that water can either flow through or stay and fill in
the empty spaces
http://ga.water.usgs.gov/edu/watercycleinfiltration.html

16. Credits and Citations
 All slides except 12:
 USGS: Science for a changing world. Ed. Howard Perlman. U.S. Department of the
Interior, n.d. Web. 12 Oct. 2012. < http://ga.water.usgs.gov/edu/watercycle.html>.
 Slide 12
 Effects of Acid Rain. U.S. Environmental Protection Agency, 8 June 2007. Web. 12
Oct. 2012. <http://www.epa.gov/acidrain/effects/index.html>.