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The Earth's gravity seems to have very little effect on ME - and I'm on its surface!
If the Earth can exert such influence on lunar rock at such a distance, why doesn't it destroy mountains lying directly on its surface?
Well, in this case I think the term "waves" is a bit misleading.
I'm pretty sure the rocks on the side of the moon that's always facing earth, with time (LOTS of time), eventually got pulled towards us, thus making them higher than the ones on the other side.
So the Earth's gravity is sufficiently powerful to cause 7 metre high waves - not of water, but of ROCK - to ripple across the Moon's surface, despite the Moon being almost a quarter of a million miles from the Earth.
It is not easy to estimate how far away from the Earth the Moon was when it formed, but simulations suggest is was about 3-5 times the radius of the Earth, or about 19-30 thousand km. (The Moon is currently about 384,000 km away from Earth or 3-4 thousand times further away than this.)
reply to post by CJCrawley
As for mountains, they are literally floating on electrostatic force. The buoyancy of granite in a medium of the Earth's mantle is greater than a bubble of air under water.