Gravity. The mass of the earth exerts a force on everything around it in an equal manner, pulling toward its center. The oceans are a layer of water on the surface of the "ball" and the elevation of all the oceans is the same everywhere, i.e. sea level.
Gravity. The mass of the earth exerts a force on everything around it in an equal manner, pulling toward its center. The oceans are a layer of water on the surface of the "ball" and the elevation of all the oceans is the same everywhere, i.e. sea level.
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