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Message: <blockquote data-quote="Channel Hopper" data-source="post: 272946" data-attributes="member: 175144">The gravitational pull of all the mass of the Earth (in all directions) over the diameter of some 8000 miles, when compared to the pull of a mass some 250,000 miles away, means that there is very little effect on the core.The water on the surface of the Earth is visible as a result of the periodic harmony of the moons movement over 28 (ish) days and the ability for the seas to ebb and flow water through channels around the planet.The analogy of the paint thickness on a cricket bat is a good one (though I thought only linseed oil was used on willow);) , and the maximum tide (I think 9m is recorded in Inchon, Korea) is almost as insignificant compared to the overall depth of the oceans.</blockquote>