What was a great dying?
Great dying, formally Permian-Triassic EXTICTION event, refers to the greatest mass extinction of life on Earth throughout history. It happened 252 million years ago (Mya) at the end of the Palaeozoic era between the Permian and Triag periods, long before the dinosaurs wandered.
The world looked much different during the Permian period. The continents were pushed together by the strength of plate tectonics into the only supercontinent known as Panga, which stretched from the North Pole to the South Pole. The surrounding super-ocean from Panthalassa was full of mushrooms, corals, starfish, clams, sea scorpions and bony fish. Amphibians crawled in wetlands and insects explored ferns and primitive trees, while therapy or strange mammals similar to reptiles that resembled a predecessor with dinosaurs. But in a time range of only 80,000 years, 95% of the whole life would extract.
There are different theories that explain a great dying, but it could be a combination of events that led to mass extinction. Self -madeThe tunnel panta suffocated the cold oceans, which previously surrounded the smaller continents, which now lay with a large part of their land stored in hot, dry interiors. The average temperature was steadily increasing over millions of years when creating a supercontinent. Suitable habitats could be difficult to find and competition with food can have a thinned species, not if some direct extinction. Panga also changed ocean currents, salinity and weather patterns, which disrupted the balance of how life evolved. However, these changes have occurred so slowly that it is unlikely that they would be more than a contributing factor.
The main event that appeared at the same time of great dying was the creation of Siberian traps created by volcanic eruptions that continued one million years . The largest volcanic event in known history, released gases would create acid rain, greenhouse effect and global warming. Oceanic consequences from temperature rise together with changes in salinity couldt to disrupt the circulation of thermohaline or global currents. Stagnation would result in exhaustion of oxygen and nutrients, leading to global loss of marine life.
If the greenhouse effect created by prolonged vulcanism sufficiently raised ocean temperatures, this would cause other consequences for which there are scientific evidence: hydrate hydrate hydrate .
Paul Wignall found that the signature of carbon isotope in layers from Greenland dating back to the time of great dying indicated a significant increase in carbon-12, which is irresponsible by standard explanation. Geologist Gerry Dickens suggested that the rise in deep seas temperatures would release frozen methane hydrate from the sea pumpkins and release the catastrophic amount of methane gas. This would be distributed across the oceans and was released into the atmosphere, which represents a layer signature. Methane gas is another powerful greenhouse gas. The released volume would increase the average again another 9 degrees Fahrenheit (5 degrees Celsius). That would be enough to killThe majority of life.
Theory with less evidence suggests the impact of a comet or meteor, but there is little evidence of it as a cause of great dying, while there is enough evidence that such an impact is responsible for the fact that the governance of dinosaurs ended about 187 million years later. Another theory suggests that the event of the supernova within ten Parsecs (32.6 light -years) of the Earth could destroy the protective layer of the upper ozone layer for several years. This ozone layer filters ultraviolet (UV) radiation from the sun. Without it, UV rays would kill almost all their lives on Earth and in the sea. There are some geological evidence that briefly became the destruction of ozone, but the record is inconclusive in this theory.
A large dying or permic triasic extinction was the greatest known disaster in history. However, it clarified the way for the next big event, which would lose 25 million years later: the birth of dinosaur and the age of reptiles.