Scientists announced Monday that it was not the asteroid impact that killed off the dinosaurs 66 million years ago, but debris ejected played a critical role.The statement comes from a team led by the Royal Observatory of Belgium, which determined dust from pulverized rock was thrown into Earth's atmosphere, blocking the sun and hindering the photosynthesis of plants. the amount of dust was about 2,000 gigatonnes - exceeding 11 times the weight of Mt. Everest - and lingered in
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