The moon is round because the gravity that is pulling things towards the centre of the moon is acting in all directions equally. This is also why the planets are round.
And you can try to demonstrate this by putting a series of tennis ball onto a piece of string and then start turning fast enough for the string to rotate round you. The tennis balls have the same pull of ‘gravity’ (actually centrifugal force in this case, but it will work anyway) all the way around you and illustrate different layers of the moon (or other planets).
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