Before the earth was formed, there was a lot of dust masses rotating around a bigger mass which was in the center. Dust masses continued to impact the bigger mass, and made the bigger mass spin around it's axis.
day and night
The earth's rotation causes the pattern of light and darkness which we call "day and night".
Days and nights, sunrises and sunsets.
night and day
Sunrise and sunset.Rotation of wind systems on the way into low pressure and out of high pressure.
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