What Killed the Ice Age Megafauna
At the end of the last ice age, many of the world's largest animals, the megafauna, went extinct, from woolly mammoths to giant ground sloths.…
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What Caused the Great Dying
The Permian extinction, often called the Great Dying, was the most severe mass extinction in Earth's history, around 252 million years ago, when the…
The Cambrian Explosion
The Cambrian explosion was a remarkable burst of evolution, beginning around 540 million years ago, when most of the major groups of animals appeared…
What Causes the Ice Ages
Throughout its history, the Earth has repeatedly cooled into ice ages, when vast sheets of ice spread across the continents, and warmed again between…
What Killed the Dinosaurs
Around sixty six million years ago, the dinosaurs and many other forms of life suddenly vanished in one of the great mass extinctions in Earth's…