Which term describes Earth's spin on its axis?

Which term describes Earth's spin on its axis?

• A. Tilt
• B. Rotation
• C. Orbit
• D. Revolution

Answer: (B)

Rotation is the turning motion of Earth around an imaginary line that runs through its center, the axis. This spin is what produces day and night as different sides of the planet face toward or away from the Sun, and it completes roughly once every 24 hours. The axis is tilted about 23.5 degrees relative to Earth’s orbital plane, which influences the distribution of sunlight and the seasons, but that tilt is a separate property from the actual spinning. Orbit or revolution describes the path Earth takes around the Sun, not the spin on its own axis. Tilt describes the inclination of the axis, not the spinning motion.

Rotation is the turning motion of Earth around an imaginary line that runs through its center, the axis. This spin is what produces day and night as different sides of the planet face toward or away from the Sun, and it completes roughly once every 24 hours. The axis is tilted about 23.5 degrees relative to Earth’s orbital plane, which influences the distribution of sunlight and the seasons, but that tilt is a separate property from the actual spinning. Orbit or revolution describes the path Earth takes around the Sun, not the spin on its own axis. Tilt describes the inclination of the axis, not the spinning motion.