Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing ...

But while lifeless during that time, the planet was already covered by vast oceans dotted with hydrothermal vent systems that ...

A crater at the edge of the Yucatán peninsula in Mexico was created by a massive asteroid that hit Earth 66 million years ago At the end of the Cretaceous Period 66 million years ago, an ...

Over two hundred fifty million years ago, India, Africa ... the collision of India with Asia we must first look beneath the Earth's surface. The continents are carried by the Earth's tectonic ...

Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ... around two billion years ago. About 800 million years ago, oxygen ...

The Early Cretaceous Epoch lasted from 145 million years ago to 100.5 million years ago and the Late Cretaceous ... had moved almost into the positions they are in today. Back then Earth was a lot ...