Seasons
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These sites can help in your class' study of the seasons:
Seasons in the Virtual Classroom - http://www.mrdowling.com/601-seasons.html
Why Leaves Change Color - http://www.esf.edu/pubprog/brochure/leaves/leaves.htm
The Seasons - http://csep10.phys.utk.edu/astr161/lect/time/seasons.html
What Causes the Seasons? - http://windows.arc.nasa.gov/cgi-bin/tour_def/the_universe/uts/seasons1.htm
New Science: A Change of Season - http://liftoff.msfc.nasa.gov/News/2001/News-AutumnalEquinox.asp
Here Comes the Sun - http://vortex.plymouth.edu/sun/sun1.html
BrainPOP - Seasons - http://www.brainpop.com/science/weather/seasons/index.weml
The Seasons - http://www2.worldbook.com/features/features.asp?feature=seasons&page=html/seasons.htm&direct=no
Spring and Fall Equinox - http://solar.physics.montana.edu/YPOP/Classroom/Lessons/Sundials/equinox.html
Summer Solstice - http://www.treasure-troves.com/astro/SummerSolstice.html