Rotation is the spinning of an object on its axis. For example, Earth rotates once every 24 hours, which causes day and night.
Revolution is the movement of one object around another object. Earth revolves around the Sun once every 365 days, which gives us one year.
The heliocentric model is the idea that the Sun is at the center of the solar system and the planets revolve around it. This model was supported by scientists like Copernicus and Galileo.
The geocentric model is the earlier belief that Earth is at the center of the universe and that the Sun, Moon, and planets move around Earth.
Density: Mass/Volume
Free Earth Science Vocabulary Worksheet
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