This is interesting OP. Mystery of Giza has troubled my imagination for several years.. It is intriguing to think that ancient Mesopotamian
civilization would be much older than currently assumed. Modern history science dates it back somewhere 5500 - 3500 BC, but recent evidence indeed
suggests that it might be older, around 10500 BC as shown above.
So far I have produced two different theories for my own amusement, so I'll just share them..
So, there were lakes, woods and plentiful rains in Sahara back in those days - they had effective watering systems, so effective that it eventually
dried the land up.
If we accept the mainstream hypothesis that modern man originated from Africa, then the first true civilizations may have been established in northern
africa as the population in southern parts grew, so that eventually there were not enough food for all the hunter-gatherers. So omnitricky nature made
man to use his brains and so they invented artificial watering systems and first time in history mankind were blessed with surplus of food in great
quantities. This allowed civilization to evolve as there were extra time at hand for the people, so they could specialize in certain trades.. First
there were all kind of carpenters, molders and smiths that produced diary items in exchange for their food. Later when money was invented, they
received their payment in money, which they could use in other products as well.
So the civilization went happily on, until one day there was not enough water available to wet the crop. What happened? Well, my another theory is
that they over cultivated the land, used the water in unsustainable fashion. Also they had chopped the plentiful woods of the region for the building
and energy needs, and this caused the water flee from soil as the tree roots won't bind it anymore. Eventually they started the desertion of Sahara,
but of course it took thousands of years to end up like it is now..
Basically same as the 1st theory, but destruction of the civilization was caused by a catastrophic event, like asteroid or poleshift (or possible
both). This was a sudden event that could have occurred somewhere between 10500 - 5000 BC. This caused climate change causing the Sahara region to
become more hostile for life.
I actually have a third theory that is supportive to the modern history. Let's say that ancient Egyptians were proficient in astrology at the time.
Their priests and scientists had recorder the nightly sky and its stars for thousands of years, let's assume that they had astronomical records
dating back to 10500 when land was more fertile and gods more favourable
In other words, their records would date back to the time before the
climate became more hostile and forced some of the civilization to move on another locations. But some people remained in Nile and other river areas
that could still sustain life, and then they fell into false beliefs and myths of old times.. They build a great monument of Giza to regain the favor
of gods, they build it according to the star model they had, they thought something like: "if we build a model resembling those days, maybe the gods
will favor us again?".. So they went and build Giza around 5000 - 3000, or when its currently dated?
[edit on 13-2-2008 by v01i0]