Here are 10 arguments trying to prove that Earth is flat :

The horizon always appears flat.
Water always seeks its own level. If the Earth were round, water would curve with the surface, creating a bulge in the middle.
Earth doesn't move. If the Earth were spinning or orbiting the sun, we would feel it moving.
There's no curve in photos of the Earth.
The sun and moon are the same size.
Gravity doesn't exist.
Airplanes fly level. If the Earth were round they would fly into space.
The Earth is surrounded by a dome. That explains the shape of the horizon and the movements of the sun and stars.
The curvature of the Earth cannot be measured. Experiments designed to measure the curvature of the Earth, such as the Bedford Level Experiment, have failed to demonstrate any curvature.
The absence of a noticeable increase in altitude when traveling. If the Earth were round, we would experience a noticeable increase in altitude when traveling over long distances, such as flying from one side of the world to the other.
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