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Fourth Edition, New York, NY, McGraw-Hill 2004.
Abruscato, Joseph,
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Allyn & Bacon A Pearson Education Company, 2001.
Miller, Debbie,
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Stenhouse Publishers, 2002.
Trumbauer, Lisa,
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Trumbauer, Lisa,
Teacher’s Guide: The World of Matter,
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US Department of the Interior and US Geological Survey, “Water Science for Schools: The Water Cycle”, August 2006, from http://ga.water.usgs.gov/edu/watercycle.html.
Anatomy of a Lightning Stroke,
Copyright 2008 USA TODAY, a division of Gannett Co. Inc. from http://www.usatoday.com/weather/tg/wstroke/wstroke.htm
