Sources

http://www.ecology.com/2011/09/10/tilting-earth-shaping-seasons/
https://fretzreview.wikispaces.com/Seasons-Causes+Group+1
http://quizlet.com/18396081/ches-5th-grade-weather-flash-cards/
http://wallpas.com/blossom-flower-mountain-spring-wallpaper.html
http://wallpaperotation.com/fall-nature-hd-wallpaper/
http://physics.weber.edu/schroeder/ua/SunAndSeasons.html
Mrs. Hillenburg's Study Guide