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I agree with your point about separating the weathering of the head, from that of the rest of the 'feature'; but, as I understand it, to make the Sphinx's body, a large U-shaped trence was carved out around a central area that was to become the body. If this is indeed the case, we may separate the head-weathering mechanisms, but that of the body (the inner wall of the trench) and the outer wall of the trench should at least be very similar, IMO.