Earth - Third planet from the sun and the only planet in the Solar System were life exists. , Rotation - Making a complete spin on an axis, Axis - An imaginary line the Earth rotates around, Cycle - A sequence of events that repeats itself, Shadow  - A dark area made by blocking light from reaching a part of the surface , Sun - The star at the center of the solar system that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit, Shape  - The outline of something,

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