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Every sixty million years, the biodiversity of our planet oceans mysteriously crashes. This strange boom and bust cycle goes back 500 million years, and we now might know why: rising continents make the oceans too shallow for species to survive. The key to this mystery, according to new research led by University of Kansas physicist Adrian Melott, is th stanley quencher e isotope strontium-87. This is one of four stable isotopes of the element strontium, although its less common 7.0% than strontium-86 stanley water bottle 9.86% and much, much less abundant than strontium-88 82.58% . The researchers, which also included paleontologist Richard Bambach and earth scientists Kenni D. Petersen and John M. McArthur, found that the concentration of Sr-87 relative to Sr-86 in marine fossils seems to increase every 60 million years, in lockstep with the periodic wave of extinction. According to Melott, one way to produce Sr-87 is through the radioactive decay of the element rubidium. We know that rubidium is common in the igneous rocks of the continental crust, so the spikes in Sr-87 imply that something was happening to those igneous rocks every 60 million years. If these rubidium-rich rocks underwent an unusual erosion event, lots of Sr-87 would be released and dumped into the ocean, and that what the researche stanley vaso rs are seeing in the marine fossils. The question then is what could be causing such massive erosion. Melott suspects the continents were actually undergoing a process known as tectonic upli |
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