- The Seasons - visual explanation of the cause of seasons.
- Lesson: The Seasons - offers a lesson on how the earth rotate and why there are seasons.
- Bad Astronomy: What Causes the Seasons? - article explaining that the seasons are mostly due to the axial tilt of the Earth.
- Seasons and the Earth's Orbit - Milankovitch Cycles - Milankovitch Cycles
- World Book: The Seasons - introduction to the four periods of the year; marked by changes in temperature, weather, and the length of daylight.
- PrimaryGames.com: The Four Seasons - seasonal craft activities for young children.
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