Did dinosaurs lose their dominance suddenly or gradually? Some scientists think the answer lies locked within the remnants of long-dormant volcanoes. Massive beds of ancient lava found around the ...

Not only did mammals likely compete with dinosaurs for resources, many species survived the end-Cretaceous extinction and subsequently came to dominate Earth. A gradual decline in the number of ...

The melting of ice sheets won’t just trigger a mass extinction event, but a gradual and total collapse of life. This rapid melting may not always look like cracking rocks, spilling dams ...