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What Is The Largest Desert In Northern Africa – When most people think of a desert landscape. Quicksand and a hidden oasis They often picture the Sahara Desert, but 11,000 years ago, what we know today as the greatest hot desert was not known. on Earth. The dry part of North Africa is now green and vibrant. It is full of lakes, rivers, forests and forests. So, where did the water go?
Geologist David Wright believed that humans and their goats are equal. and started this amazing ecological change. In a new study in the journal Frontiers in Earth Science, Wright tried to argue that humans can answer a question that has troubled archaeologists and paleontologists for years.
What Is The Largest Desert In Northern Africa
The Sahara desert has wet and dry seasons. These changes are caused by small oscillations in the tilt of the Earth’s orbital axis. This changes the angle at which the sun’s rays enter the atmosphere. in many times throughout the history of the world. Energy from the sun is especially abundant during the West African monsoon. And during these periods, called the African monsoons, rain falls again in northern Africa.
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In heavy rains the area will be greener and there are many streams and lakes. All this has been known for many years, but between 8,000 and 4,500 years ago, something strange happened: A change from wet to dry that can be explained . Orbital motion only. “Scientists often call this ‘Misparameterization’ of the data,” Wright said via email. “I mean, we don’t know what we’re missing here — but something just isn’t right.”
Although Wright researched the archaeological and environmental data, (mostly sediment cores and pollen. All the records are at the same time.) He saw the pattern. Where the archaeological record shows that there were “herdsmen” – people and their livestock – there is a corresponding change in nature and plant species. It is like all the times when people and goats and cattle go to feed. They turned everything into a desert.
Wright thinks that’s what happened. “Providing lots of grass reduces the amount of moisture in the atmosphere—clears the vegetation that produces clouds—and increases the albedo,” Wright said. change direction These nomads may have used fire as a tool to protect the land. This is what drives the speed of the desert.
It is important to note that the Sahara desert has turned into a desert without human intervention. This is how the world works. said geologist Jessica Tierney, associate professor of geosciences at the University of Arizona Also, according to Tierney, we don’t need people to explain the sudden change from green to desert.
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The reason for the idea is from old plants and soil changes. “Early on, the Earth’s atmosphere changed very slowly,” Tierney explains. “When it happens, the West African Monsoon will weaken a little. You will spoil the view a little. It will change from desert to vegetation and sometimes you will go to a point where the change is fast. ‘
Tierney added that it is difficult to identify the cause of the cascade in the system. because everything is related during the high humidity before The Sahara desert was full of hunters. when the road gradually changes and the rain decreases People need to raise animals like cows and goats to survive. or excessive grazing practices accelerate [leaf] denudation,” Tierney said.
Who is first It is difficult to say with the evidence we have now: “The question is, how do we try this case?” he said. It’s a chicken and egg problem.” So did Wright. Remember now that we only have evidence of correlation, not causation.
But Tierney was intrigued by Wright’s research. And he agrees that more research is needed to answer these questions.
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“We need to dig deeper into the dry lake that is being dispersed. The Sahara desert and see pollen and seeds. They compare that data with archaeological data, “said Wright. “Maybe we can develop a specific idea about why the speed of climate change in the end of the AHP is not consistent in orbital period and inconsistent in North Africa.”
Tierney recommends that researchers use a mathematical model to compare the impact of hunter-gatherers on the environment with pastoralists. for that example At that time many people were thought to be living in the Sahara. But Tierney knew there were more people in the area than today. Beyond the beach of the city
Although the change between the Sahara and the desert is the cause of climate change, it is important to note that this process is different from what we think of as change. done by people. Today’s (anthropogenic) emissions are due to rising levels of CO2 and other greenhouse gases. But that doesn’t mean these studies can’t help us understand the impact humans have on the environment today.
“It’s a big deal,” Tierney said. “Understanding how these feedback loops work will improve our ability to predict climate change for arid and semi-arid regions.”
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Wright sees a big message in this type of study. “People don’t live in an ecological environment,” he said. “We are a very powerful species. and because of this we have a great impact on the entire ecosystem of the world. Some of these things can be good for us. But some threaten the long-term sustainability of the world. “
He is also the author of The Last Voyageurs: Retracing La Salle’s Journey Across America. verb Find out if the idea is fact or fiction.
Fact and Fiction: There are many deserts in the world. But no desert is as famous and important as the Sahara. Located in North Africa, the Sahara desert covers half of the country and covers 10 countries: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, Western Sahara, Sudan and Tunisia. The Sahara desert is often considered the largest desert in the world. Today we are testing his ideas. Dive in to find out if it’s true or not that the Sahara is the world’s largest desert. What is a desert? When you think of the desert, the first image that comes to mind is the scorching heat. Endless sand dunes, palm trees and camels. This is the common sense of a desert that most people have. However, the desert doesn’t have to be hot or sandy or crowded. By scientific definition, a “desert” is a place where vegetation is sparse, water is scarce, and the environment is poor. But there are also many cold deserts in the world. covered in snow all year round How about a desert? Creating a desert is a long process that can take centuries. Some deserts were grass in ancient times. with the Sahara desert But now it’s dry and rough. Deserts are formed by natural destructive processes. It can be caused by corrosion and other contaminants. over a long period of time or due to the rotation of the earth around the sun or a change in the magnetic axis. The main reasons for the creation of deserts are due to natural causes. Water comes from oceans and other bodies of water. continue to condense and condense into water vapor as clouds form when the wind is blocked This may be due to a pressure difference or due to a mountain Air loses its consistency due to the rain This causes some areas to be dry and some areas to be overgrown. This event continues for many years. Deserts are formed by subtropical deserts coastal deserts sheltered inland deserts polar deserts Where is the Sahara Desert located? The Sahara desert covers most of North Africa and is found in 10 countries: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, Western Sahara, Sudan and Tunisia. The ancient Sahara desert. Covered with green fields and lakes. But because the gravity of the Earth has changed. causes of temperature rise Other environmental factors such as snow fall and pressure differences result in low and dry rainfall.
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