I think the most realistic theory of the whole sphinx erosion thing is this one:
The head is much older than the base, and a long long time ago some ancient civilization carved a protruding chunk of rock poking out of the ground into a head. Later, the Egyptians re-carved it into their own sculpture and uncovered more of the stone and carved/built up the lion body underneath it. That explains why there are some parts, like the head, that have different weathering (including possible water related weathering) than other parts that aren't as old.
I saw a good clip on some other program about this theory once that had artist's renderings of the original head poking up when it was wetlands, then later the Egyptian's re-carving it and adding the body, then it being recovered by the sand (like it was found before they uncovered the body and started restoring it).
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In the words of Jello: "Punk ain't no religious cult,punk means thinking for yourself. You ain't hardcore cause you spike your hair, when a jock still lives inside your head."
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