The world was a warmer place during the Cretaceous period. The poles were cooler than the lower latitudes, but "overall things were warmer," Kruk told Live Science. Fossils of tropical plants and ferns support this idea, she said.
Animals lived all over, even in colder areas. For instance, Hadrosaurus fossils dating to the Late Cretaceous were uncovered in Alaska.
When the asteroid hit, the world likely experienced so-called "nuclear winter," when particles blocked many of the sun's rays from hitting Earth
Animals lived all over, even in colder areas. For instance, Hadrosaurus fossils dating to the Late Cretaceous were uncovered in Alaska.
When the asteroid hit, the world likely experienced so-called "nuclear winter," when particles blocked many of the sun's rays from hitting Earth
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