Question

how are day and night caused

Answer 1

Due to rotation of the earth day and night cause.
The portion of the earth which faces the sund will have daytime and the portion which do not face the sun have night time.

Answer 2

Due to the rotation of earth. The earth one side faces towards the sun and the other opposite to it. When the earth rotates these sides changes and the portion which is towards the sun have Day. And the side facing opposite have night

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