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Methane Extinctions - Could this Explain the Carolina Bays?
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Jun 2010 - The Permian-Triassic Extinction Event, the largest extinction in history, could have been caused by huge, worldwide methane explosions, says Dr. Gregory Ryskin, Professor of Chemical Engineering at Northwestern University
As a gas it is flammable only over a narrow range of concentrations (5–15%) in air. Liquid methane does not burn unless subjected to high pressure (normally 4–5 atmospheres).
Potential health effects
Methane is not toxic; however, it is highly flammable and may form explosive mixtures with air. Methane is violently reactive with oxidizers, halogens, and some halogen-containing compounds. Methane is also an asphyxiant and may displace oxygen in an enclosed space. Asphyxia may result if the oxygen concentration is reduced to below 19.5% by displacement. The concentrations at which flammable or explosive mixtures form are much lower than the concentration at which asphyxiation risk is significant.
the Permian-Triassic Extinction Event, a mysterious period in Earth history where 95% of all species went extinct.
Vast volumes of basaltic lava paved over a large expanse of primeval Siberia in a flood basalt event. Today the area covered is about 2 million km² – roughly equal to western Europe in land area – and estimates of the original coverage are as high as 7 million km². The original volume of lava is estimated to range from 1 to 4 million km³.[