Some of the Great Extinctions have been caused by the shock waves of large asteroid impacts reverberating within the mantle and fracturing weak spots in the Earth’s crust and triggering prolonged vulcanism and creating stupendously massive flood basalt fields (LIPs) that released so much CO2 that the greenhouse effect was amplified to the point that extinctions followed.
Note: There have been multiple Chicxulub-type impacts on Earth over the last billion years, as inferred from lunar impact craters, numerous multiple ‘large igneous provinces’ all around the world, and extensive geologic analysis.
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