Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years. Mountains have been built and eroded, continents and oceans have moved ...

Ask an archaeologist how old the site they’re excavating is, and they may not have an answer. Though they may have a hunch, a site can only be accurately dated after it’s been discovered and excavated ...

Paleolithic hunters built mammoth traps in what is now Mexico some 14,700 years ago. An unknown sea creature left footprints in sand some 550 million years ago, making them the oldest known footprints ...