Here's why:

* Gravity is a fundamental force of nature: It's a force of attraction between any two objects with mass. The more mass an object has, the stronger its gravitational pull.

* Earth's rotation causes other phenomena: Rotation is responsible for things like day and night, the Coriolis effect (which affects weather patterns and ocean currents), and the slight bulging of Earth at the equator.

* Gravity exists even without rotation: If Earth stopped rotating, gravity would still be present, holding us to the ground and keeping the moon in orbit.

Think of it this way: A spinning top has gravity pulling it down, but its rotation doesn't create that force. It just makes the top spin!