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This question already has an answer here:

Obviously the earth's oceans have mass and therefore they have an attractive force upon the moon.

However, let's say that we were to cover most of earth with tidal power generators that extract some of this energy from the ocean. Could this affect the moon?

How about if we were to otherwise freeze the earth's oceans, or lock them in with a layer of cement to prevent them from being tidal?

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marked as duplicate by John Rennie, dmckee Oct 14 '15 at 15:41

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