was egypt always a desert
This was a good place to live 8000 years ago. It’s a bit of a chicken and an egg problem.” Wright, too, cautions that right now we have evidence only for correlation, not causation.But Tierney is also intrigued by Wright’s research, and agrees with him that much more research needs to be done to answer these questions.“We need to drill down into the dried-up lake beds that are scattered around the Sahara and look at the pollen and seed data and then match that to the archaeological datasets,” Wright said. By 6000 BC predynastic Egyptians in the southwestern corner of Egypt were herding cattle and constructing large buildings. It is believed that from 8000 to 6000 BC it was rather green. And then at some point you pass the tipping point where change accelerates.”Tierney adds that it’s hard to know what triggered the cascade in the system, because everything is so closely intertwined. But 11,000 years ago, what we know today as the world’s largest hot desert would’ve been unrecognizable. Future US, Inc. 11 West 42nd Street, 15th Floor, But between 8,000 and 4,500 years ago, something strange happened: The transition from humid to dry happened far more rapidly in some areas than could be explained by the orbital precession alone, resulting in the Sahara Desert as we know it today. During the last humid period, the Sahara was filled with hunter-gatherers. There were even large rivers, such as the Wadi Howar, once the largest tributary to the Nile from the Sahara. “Which is to say that we have no idea what we’re missing here—but something’s wrong.”As Wright pored the archaeological and environmental data (mostly sediment cores and pollen records, all dated to the same time period), he noticed what seemed like a pattern. Disputes over land were often settled with the fist, as evidenced by the cemetery of Jebel Sahaba where many of the buried individuals had died a violent death.But around 10,500 years ago, a sudden burst of monsoon rains over the vast desert transformed the region into habitable land.This opened the door for humans to move into the area, as evidenced by the researcher's 500 new radiocarbon dates of human and animal remains from more than 150 excavation sites. When most people imagine an archetypal desert landscape—with its relentless sun, rippling sand and hidden oases—they often picture the Sahara.
“How do we isolate the climatically driven changes from the role of humans? This was a good place to live 8000 years ago. (Image: © © Science) The great desert was born some 7 million years ago, as remnants of a vast sea called Tethys closed up The Sahara, the world’s largest non-polar desert, may be … Short answer, no. At the end of the last Ice Age, the Sahara Desert was just as dry and uninviting as it is today. Why isn't any camel gods part of Egypt if they were living in a sandy world, they had cat, bird, crodile and many other animal gods besides a camel. All this has been known for decades. “By overgrazing the grasses, they were reducing the amount of atmospheric moisture—plants give off moisture, which produces clouds—and enhancing albedo,” Wright said. At With more rain, the region gets more greenery and rivers and lakes. Sahara Desert Was Once Lush and Populated View of the Great Sand Sea of Egypt from the Gilf Kebir Plateau. Interestingly, it hadn’t always been that way. © Wherever the archaeological record showed the presence of “pastoralists”—humans with their domesticated animals—there was a corresponding change in the types and variety of plants. These fluctuations are caused by slight wobbles in the tilt of the Earth’s orbital axis, which in turn changes the angle at which solar radiation penetrates the atmosphere. It’s hard to say with evidence we have now. "Wildlife included very demanding species such as elephants, rhinos, hippos, crocodiles, and more than 30 species of fish up to 2 meters (6 feet) big," Kroepelin told Stay up to date on the coronavirus outbreak by signing up to our newsletter today.Thank you for signing up to Live Science.
“As that’s happening, the West African monsoon is going to get a little bit weaker.
These nomadic humans also may have used fire as a land management tool, which would have exacerbated the speed at which the desert took hold.It’s important to note that the green Sahara always would’ve turned back into a desert even without humans doing anything—that’s just how Earth’s orbit works, says geologist Jessica Tierney, an associate professor of geoscience at the University of Arizona. But sandwiched between two periods of extreme dryness were a few millennia of plentiful rainfall and lush vegetation.During these few thousand years, prehistoric humans left the congested Nile Valley and established settlements around rain pools, green valleys, and rivers.The ancient climate shift and its effects are detailed in the July 21 issue of the journal Some 12,000 years ago, the only place to live along the eastern Sahara Desert was the Nile Valley. “Scientists usually call it ‘poor parameterization’ of the data,” Wright said by email. New York,
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