# 200 Proof: Water is Level

One of the best things about water is that when I put it in a cup, it stays there. It doesn’t just go sloshing around. Same thing for lakes and ponds. The surface is flat. So the Earth is flat:

3) The natural physics of water is to find and maintain its level. If Earth were a giant sphere tilted, wobbling and hurdling through infinite space then truly flat, consistently level surfaces would not exist here. But since Earth is in fact an extended flat plane, this fundamental physical property of fluids finding and remaining level is consistent with experience and common sense.”

I have already explained why on a small scale the Earth looks flat to the unaided eye (including land and water), and you can see how curved the oceans look only from very far away:

Okay, so what’s the deal with water not just running down the curved surface of the Earth like it would a hill? Wouldn’t the water just roll down the tilt?

To understand this, you need to understand gravity, since that is what keeps things attached to a planet. Water is acted on by gravity to keep it level around the surface of the ball Earth. That means that water is the same distance from the center of Earth’s mass when in a container (cup, lake, or swimming pool). To have water pour off the bottom half of Earth would take as much energy as to launch it up into space with a rocket.

The wobbling and hurdling really do not contribute to any movement of water either. The water is also hurdling and wobbling with the Earth. Since people, Earth, and water all wobble the same, then it is unnoticeable. It is like driving in a car on a highway with no other cars around and a nice straight path. The only thing an occupant of the vehicle will notice is that it is not difficult to drink water or do anything he would while not moving. As soon as the car accelerates (slams on the break, presses the accelerator, turns relatively sharply, hits a bump in the road, or goes up/down a hill), the occupant will feel that acceleration. The same thing happens on an airplane traveling at 100s of miles per hour without turbulence. Two people could play a game of catch throwing a ball forward and backward on the airplane as if they were not moving. Again, since people move with the Earth, there is no difference in movement to perceive for people or water.

The other time movement might seem to matter is when the occupants of a vehicle open the window. Air rushes in and blows everything around. So shouldn’t the movement of Earth push the water around? It would if there were anything to push against as it orbits the sun. Most of the space is empty (it ends up amounting to about 50,000 tonnes per year crashing into Earth-not a lot on a planetary scale). Opening windows in a vacuum would have no rushing in of air. Most of the air on the planet is held in place by gravity. Still some escapes because it is not strongly enough attracted to the Earth’s gravitational pull (Hydrogen and Helium). This rushing out of air into the vacuum of space is too small and far away from the surface of the water to cause any effect.