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impact crater egypt site:freerepublic.com |
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I watched on TV a nature channel show called The History Of The Earth two evenings ago. The program discussed the Sahara desert. According to the program– up until 3 million years ago the Sahara was underwater. For the last 3 million years the Sahara has gone from wet savanna with many lakes bigger than the great lakes — to desert — and back again. This has occurred every 20,000 years. Why? the Earth wobbles on its axis every 20,000 years and shifts its position enough to make the the African monsoons shift north. Scientists found that the shift of the earth axes coincided with shifts in sedimentary cores in the Atlantic. That is, every 20000 years the Atlantic cores would show sand intrusions from the Sahara that would stop abruptly at 20000 year intervals at the time when the earth wobbles on its axis.
The Atlantic cores show that the Sahara was a verdant savanna with many huge lakes–more lakes and bigger than the great lakes– up until 5500 years ago or 3500 BC. Then abruptly–in less than 200 years–the Sahara dried up. This coincided with the last wobble of the earth on its axis.
As well, this coincides with the emergence of the old Kingdom in Egypt and (very roughly) the earliest parts of Stonehenge.(I’ve thought for about a decade that about 5000 years ago for the first time people all over the world looked up. I thought the triggering event might have been a destructive comet but a big change in the night sky caused by earth’s wobble would make better sense.)
The show concluded that the sandstone rocks of the Sahara contain immense aquifers of water that could pumped up to turn the deserts there green. Scientists were uneasy about draining the desert of its archaic water because a wholesale program that did turn North Africa green would deplete its archaic water supplies in 100-200 years. And there’s another 15,000 years before the rains return.
imho considering that well water is cheaper than desalinated water–so cheap that it could be used for agriculture now — the best bet to turn north Africa green is well water. In time desalinated water will be cheap enough to replenish the ancient aquifers.