why earth rotates?????????

Dear rishi

Bottom line: law of conservation of angular momentum.

When the solar system formed, the sun and planets all started revolving as the accreting material formed into dense regions. There is always some bias in the collapse and that results in rotation. Very little at first, but as the matter collapses to be smaller and denser, the rotation increases, like a skater does when pulling legs and arms in close. This rotation, established during the early days of the earth's formation, continues today.

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