What's the water-sphinx theory?
It has something to do with the erosion marks on the base of the Sphinx looking more like they were made by water (rains), than desert winds. If so, then the Sphinx is much older (from a wetter period) than is currently thought (it has been modified, we know that).
That the erosion on the Sphinx is from water erosion instead of wind. It is interesting and it would bring a lot of history into question.
"In 1990, Robert Schoch, a scientist and tenured university professor, traveled to Egypt and conducted geological testing to evaluate the accepted date for the construction of the Great Sphinx of Giza. His research revealed that the Sphinx is actually thousands of years older than previously supposed, a discovery that upended the standard history of ancient Egypt."