Earth rotates on axis once a day.
Meaning: This sentence describes how the Earth rotates on its axis once a day, causing day and night.
Choice of Words: Earth is the planet we live on. Rotates means to turn around on an axis. On indicates the surface or location of something. Axis is an imaginary line through the center of a rotating object. Once means one time. A day is a period of 24 hours.
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