WASHINGTON – It was a combination of calamities — an asteroid strike followed by vast volcanic eruptions half a world away — that doomed the dinosaurs and many other creatures 66 million years ago.
That is the conclusion of scientists who said on Thursday they have determined with new precision the proximity of the dates of these catastrophes: a space rock about 6 miles (10 kilometers) wide striking Mexico’s Yucatan region and colossal eruptions in India.
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