The stone quarries of ancient Egypt once produced quality stone for the construction of decorative monuments such as sculptures, obelisks, and pyramids. These quarries are now recognized archaeological sites. Eighty percent of the ancient quarry sites are in the Nile valley; some of them have disappeared under the waters of Lake Nasser and some others were lost due to modern mining activity.
Some of the sites are well identified and the chemical composition of their stones is also well known, allowing the geographical origin of most of the monuments to be traced using petrographic techniques, including neutron activation analysis.
Aliens from outer space were not responsible for the Pyramids of any of the archaeological sites. They were also not built with slave labor. The antiquities of Egypt were all built with highly paid skilled professionals who worked for years completing these master pieces.
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