Dinosaur die-out may have been the second of two massive extinctions: Huge underwater volcanoes 'killed off all the sea-life first': "Popular opinion holds that an asteroid struck the Earth 65million years ago, hustling out the Age of Dinosaurs and allowing the mammals - us - to rise.
But new research now paints another picture - with the University of Washington indicating that a separate extinction came shortly first, triggered by volcanic eruptions that warmed the planet and killed life on the ocean floor."
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