The+Reason+for+the+Seasons



** The tilt of the Earth causes the seasons. **
 * As the Earth orbits the Sun, **
 * the tilt of the Earth's axis does not change. **
 * The Earth always leans in the same direction. **

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http://www.learner.org/jnorth/tm/ReasonsBack.html
 * See an animation of Earth revolving around the sun!**