Which movement of Earth is responsible for the diurnal cycle of light and darkness, and the daily changes in temperature and humidity?
Rotation
The Earth spins on its own axis once approximately every 24 hours; this spinning motion is called rotation.
Rotation causes different parts of the Earth's surface to face toward or away from the Sun over the course of a day, producing the day-night cycle along with the accompanying daily variations in temperature and humidity.
Revolution refers to Earth's yearly orbit around the Sun, while inclination and precession describe the tilt and slow wobble of Earth's axis — none of these cause the daily cycle described here.
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