Why Are There Seasons?

You know we have four seasons: spring, summer, fall, and winter. But do you know why we have seasons? Jessi shares the answer!
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SOURCES:
http://spaceplace.nasa.gov/seasons/en/
http://www.universetoday.com/75843/why-are-there-seasons/
http://www.weather.com/news/why-are-there-seasons-20130930