There are numerous arguments, but basically other forms of erosion might do it, there’s some evidence of heavy rainfall later than previously thought, and even

There are numerous arguments, but basically other forms of erosion might do it, there’s some evidence of heavy rainfall later than previously thought, and even rainfall consistent with recent history might well be enough anyway given the poor quality of the limestone. https://en.wikipedia.org/wiki/Sphinx_water_erosion_hypothesis https://en.wikipedia.org/wiki/Sphinx_water_erosion_hypothesi...