Have you ever wondered why you don't ____ away into space? It's because of something called gravity! ____ is like an invisible force that ____ things together. It's what keeps us on the ____. The Earth is very big, and it has a lot of stuff in it. This stuff is called ____. Because the Earth has so much mass, it has a lot of gravity. Gravity pulls on everything, even you! It pulls you towards the center of the ____. That's why you stay on the ground. Imagine you are on a ____. If no one is on it, the trampoline is ____. But if you stand on it, you make a ____. That dent is like gravity! The Earth is so big that it makes a big dent that pulls everything towards it. Gravity is also what keeps the air around us. The air is made of tiny bits called molecules. Earth's gravity pulls on these bits and keeps them close. Without gravity, the air would float away, and we wouldn't be able to ____!

Gravity

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