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One has to notice that more recent impact craters are deeper relative to their diameters than older craters, the larger of which appear to have been back-filled. For example, the crater wall of Pythagoras appears to have collapsed. http://orbitalhub.com/wp-content/uploads/2008/10/kaguya-pythagoras-cr... If the Moon once had a crust and mantle like the Earth then an impact could have broken right through the crust to leave a molten "floor" to the crater which has long since solidified.
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