why does the earth orbit the moon?

No matter what we can see, the Earth and Moon are constantly pulling on each other. The Moon pulls on the Earth with a force called gravity. Gravity is a special force that makes sure that things don't fly off into space. Since the Earth is bigger than the Moon, it pulling on the Moon is much bigger than the Moon pulling on the Earth. So, the Earth always tries to move towards the Moon, and the Moon moves towards the Earth a little bit. That's why the Earth orbits around the Moon.