Rotation of the Earth
The spinning of Earth on its own axis is called its rotation. The axis is an imaginary line passing through the center of Earth. We cannot feel the rotation of Earth, because everything on Earth is also moving with it. The Earth’s axis is tilted, and is the reason why we have seasons on Earth. Earth takes 24 hours to complete one rotation. The side of the Earth that faces the Sun has daytime. The side of the Earth that is turned away from the Sun has night-time. The Sun rises in the east and sets in the west. However, it is not the Sun which moves. It is actually the Earth which spins, or rotates, on its own axis.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.