Question

how does the rotation of the earth cause day and night

Answer 1

It is day time 1 of the part of the earth facing the sun and at night time when it is completely away from the sun and does not get sunlight it experiences night. Therefore earth is constantly rotating on its axis.
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Answer 2

The earth rotates completely once in every 24 hours. The side facing the sun during rotation has day while the side that is opposite to the sun faces night.