The Sahara Desert The Climate Changes Every 20,000 Years
Sahara is a dry and unfriendly desert that is human. However, 20,000 years ago this area was an oasis for various living things and so was the fate of another 20,000 years. Researchers from the Massachusetts Institute of Technology (MIT) analyzed dust deposits that have been on the coast of west Africa for the past 240,000 years. In particular, they studied a rare isotope called thorium at each layer to find out how fast it accumulated on the ocean floor. The results of the analysis of the researchers, published in the journal Science Advances, revealed that the Sahara and North Africa change their climate between wet and dry every 20,000 years.
This change is caused by changes in the earth’s axis when it orbits the sun. Because, changes in the earth’s axis affect the distribution of sunlight between seasons. Read also: Researchers Call the Sahara Desert Can Be Green, Origin … When the earth was in a position to receive maximum sunlight in the summer, monsoon activity in the North African area became increasingly intense so the Sahara turned green. Conversely, if the position of the earth reduces the arrival of summer sunlight, then the Sahara becomes dry as it is today. Reporting from Xinhua, MIT Associate Professor, David McGee said that this discovery revealed more about the history of the Sahara desert, especially to find out when humans live in the area and cross it to get out of Africa