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Firstly you have to understand a few basic facts.

The gravitational pull of the moon causes a bulge in the waters on earth, this causes the tides.

The mass of the bulge of water also exerts gravitational pull on the moon.

And as the earth rotates it causes the bulge of water to move which pulls the moon towards it thus accelerating it.

Basically the moon is accelerating as a result of the rotation of the earth.

And contrary to what was written previously as an answer to this question the moon is not getting closer to the earth, the moon will not collide with earth.

Measurements by NASA have confirmed that the mean (average) distance between the earth and the moon is increasing by 3.8cm every year.

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13y ago

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