HTTP:: Algae May Have Caused All Mass Extinctions
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Over the course of the planet's history, there have been five extinction events that scientists know of, and each and every single one of them may have been caused by nothing more than algae. The new idea was proposed by a scientist on October 19, at the annual Geological Society of America meeting. As expected, his idea immediately sparked a heated controversy, LiveScience reports. Most scientists believe that the events may have been caused by an asteroid impacting our planet. The debris kicked in the atmosphere, coupled with the shock waves and the widespread fires that would have ensued, might have killed off many of the Earth's species. Some experts believe that the extinction events were caused by exploding supervolcanoes and massive tremors that suddenly and abruptly reshaped the world's map. There are, of course, those who believe that the extinctions took place on account of both of these scenarios happening at the same time. The cataclysmic events, which claime!
d the lives of between 50 and 90 percent of the world's species, span a period of time between 540 million years ago and 65 million years ago. According to the fossil record, and other telltale signs, the five events occurred as follows: 1. 440 to 450 Ma ago â€" the Ordovicianâ€"Silurian extinction 2. 360 to 375 M...
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http://news.softpedia.com/news/Algae-May-Have-Caused-All-Mass-Extinctions-125714.shtml
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