The conversation between human and AI assistant.
Earth is circular, so how does water remain in its place rather than falling?
Right, gravity. But why doesn't the water just fall down to the bottom of the planet?
The short answer is that gravity is pulling everything towards the center of the Earth, so everything is being pulled inwards rather than downwards. When you're standing on the surface of the Earth, you're actually being pulled towards the center of the planet, and so is the water around you.