What is the cause of the 24 hour day on earth?

Answer 1

the rotation of the earth around the sun.

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No.

It is the rotation of the earth on its own axis.

Answer 2

The 24-hour day on Earth is primarily caused by the planet's rotation on its axis. As Earth rotates, different parts of the planet are exposed to sunlight, creating day and night. This rotation period has been relatively consistent over time, leading to the establishment of a 24-hour day.