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seasons
| Term | Definition |
|---|---|
| Axis | An imaginary line the extends through the Earth's north pole and out the south pole; tilted at 23.5 |
| Rotation | To spin on an axis |
| Revolution | Movement in an elliptical path around a center |
| Season Cycle | The cycle of summer, fall, winter, and spring due to variation in intensity of the sun and length of day caused by the tilt of the earth |
| Day/Night Cycle | The cycle of daytime and nighttime caused by the rotation of the Earth about its axis |
| Equator | An imaginary line drawn halfway between the northern and southern poles; divides the Northern and Southern hemisphere |
| Hemisphere | Half of a sphere; the Earth is typically divided into the Northern and Sothern hemisphere |