Doggonit, read some of the authoritative references provided by some of the other Freepers.
Now, who blew the nose off the Sphinx. That'd probably be Imhotep - in fact, he erased the original face!
Islam and the Turks do not have to answer for the nose which is believed to have originally been that of a lion!
Blame Napoleon. His cannoneers used the Sphinx for target practice, blowing off its nose.