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seasons
| Term | Definition |
|---|---|
| Axis | An imaginary line the extends through the Earth 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 night time caused by the rotation of the earth about its axis |
| Equator | An imaginary line drawn halfway between the north and the south pole divides the northern and southern hemisphere. |
| Hemisphere | Half of a sphere; the earth is typically divided into the northern and southern hemisphere. |