Around 250 million years ago, the earth really end. Ninety-six percent of marine species disappeared. On land, 70 percent of vertebrates and most insects die, including some species of dinosaurs.
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| This photo from NASA's Suomi NPP satellite shows the Eastern Hemisphere of Earth in "Blue Marble" view. The photo, released Feb. 2, 2012, is a companion to a NASA image showing the Western Hemisphere in the same stunning detail. This photo was taken on Jan. 23. (Picture from: http://www.livescience.com/) |
This period is known as the era of the Permian-Triassic mass extinction. Recent research has found the theory that it takes 10 million years for the return of life. The research is published in the journal Nature Geoscience May 27, 2012 edition.
"Life seems back to normal when another crisis hit and set back the life," says Michael Benton, a member of a team of researchers from the University of Bristol in England. Carbon crisis, he said, repeatedly occur. "The condition eventually became normal again after 5 million years or more."
The researchers have not found a definite cause of mass extinctions in the period known as The Great Dying. Apparently, there are three stages of the possibilities and combinations of a number of factors. Some research suggests that global warming plays a crucial role. The incident was likely triggered by massive volcanic eruptions.
The research team analyzed previous research on post-Permian-Triassic period. Apparently, there are two reasons for the recovery time for 10 million that year. First, the research team said, the intensity of the crisis and the second is the dismal condition of the earth after the first wave of extinctions.
The results of recent studies suggest that the dismal condition of the Earth's environment to continue for 5-6 million years after the "Resurrection", in which there is repetition of the crisis of carbon, oxygen, and the adverse effects of global warming.
After a quiet environment, a more complex ecosystem begins to grow. At sea, the emerging biota, such as the ancestors of crabs and lobsters, as well as the first marine reptiles. They are form the basis of the future of modern ecosystems. *** [LIVESCIENCE | UWD | KORAN TEMPO 3894]
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