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But our current knowledge of the moon's rocks shows that they are identical to the earth's rocks and do not contain any foreign material absorbed from another celestial object.
The tip of the pear began to split off from the earth to eventually create the moon and the ongoing attraction of the moving massive object as it departed the earth, gave both the earth and the moon the same angular momentum. So when the moon split from the earth, it rotated around the earth at the same speed as the earth rotated on its own axis.With the departure of the massive object and the removal of its gravitational pull, both the moon and the earth continued to rotate together held by their mutual gravitational attraction, but both changed shape back to a rough sphere, drawn in by their own internal gravitational attraction.The strength of this process is that it explains why the earth and its moon have similar rock surfaces, simply because the moon was created purely from the earth and why the two bodies rotate at the same speed.