The theory that the Cretaceous-Paleogene Event - the mass extin... | Filo
The theory that the Cretaceous-Paleogene Event - the mass extin..…
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SOLVED:Analyze the evidence scientists provide for the cause of the Cretaceous–Paleogene mass extinction. a. the unusual abundance of iridium in the Cretaceous-Paleogene layers, the disappearance of so many species at its transition, volcanic activity that led to global warming, and the crater found in the Yucatan peninsula b. the unusual abundance of iridium in the Cretaceous-Paleogene layers, gamma-ray burst caused by a nearby supernova, rocks found in the clay layer at its boundary, and the c
SOLVED:Analyze the evidence scientists provide for the cause o…
3 months ago
numerade.com
Why did the dinosaurs go extinct?
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Mass extinction facts and information from National Geographic
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Mass extinction facts and information from National Geogra…
Sep 26, 2019
National GeographicMichael Greshko,National Geographic Staff
94 million years ago, the Cenomanian stage of the Cretaceous period was coming to an end, just as enormous volcanoes in the Caribbean were erupting, covering the ocean floor in enough lava to cover the Mediterranean Sea. The CO2 from these eruptions caused a warming event and acid rain, accelerating the phosphorus cycle and breaking down silicates in rocks, which led to an increased flow of nutrients from rivers into the Cretaceous seas. The warm waters and increased nutrients led to an explosio
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The Cretaceous Period: Major Events, Animals, and When It Lasted
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a-z-animals.com
Geologists have found that the boundary between the Cretaceous and Paleogene layers called the “K–Pg” boundary (previously known as the "K-T boundary"), in many regions is marked by high levels of the rare metal iridium. While it is true that nearly all dinosaur fossils are absent above this K-Pg boundary, the areas with high iridium levels are not restricted to the thin zone that defines this boundary. In fact, in the same regions where the K-PG boundary was discovered, recent studies have iden
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