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Tuesday, December 6, 2016

Scientists learned about the meteorite, through which on Earth there were people


The flora and fauna of the Earth, in all likelihood today would be completely different than what we know of them, if not which began about 55 million years ago, shortly after the extinction of the dinosaurs, global warming. Until now, the cause of this warming remains unclear, but a group of researchers under the leadership of Morgan Schaller from the Polytechnic Institute Rensselaer made with the assumption that the air temperature around the globe could rise because of the fall of a huge meteorite.


photo: pixabay.com

Most scientists agree that the Cretaceous-Paleogene extinction, during which the face of the Earth vanished dinosaurs and many other animals and plants, due to the fact that about 66 million years ago, a planet collided with a meteor raised a cloud of dust. After that, the plants began to die due to lack of sunlight, herbivores — due to lack of plants, and predators — due to lack of herbivores. After another 10 million years, when flora and fauna was just recovering from the previous attack, took a new cataclysm, which led to a rise in average air temperature by 5-10 degrees Celsius, and as a consequence — to the new extinction and mass migrations of animals. It is believed that in this period replaced the ancient mammals came the ones that were quite similar to the modern, and it was after this was created all of the evolutionary antecedents of humans.

So far there’s no scientific consensus on what processes or events triggered by global warming, but by far the most popular was the version according to which the Earth’s atmosphere increased the content of methane emitted in the destruction of near-bottom hydrates. However, American researchers made the assumption that the “culprit” of the warming was made by another meteorite. In favor of this theory, according to scientists, show inclusions of glass beads, found them on the depth which corresponds to the so-called postabolition thermal maximum. According to scientists, the chemical composition of these granules shows their impact and not of volcanic origin.

Their assumption, the researchers presented during the annual meeting of the geological society of America, held in Denver. It is worth noting that some of the other experts reacted to the abstracts researchers are quite skeptical and they felt that the findings require further testing and questioned the fact that the glass granules are really present in the studied rocks, and were not the result of contamination after extraction.

source

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