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The drained world

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Watson, I. The drained world. Nature 464, 640 (2010). https://doi.org/10.1038/464640a

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  1. The ocean's surface rises and falls predictably due to changes in gravitational forces originating from the Moon and the Sun. These changes in ocean surface level are known as tides and are evidence of the influence celestial bodies have on our planet. Without these external forces, the ocean's surface would simply exist as a geo-potential surface or geoid, where the water is pulled by gravity without currents or tides.
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