The Grand Canyon is a gigantic geological library, with rocky layers that tell much of the story of Earth’s history.

The tiny Juan de Fuca plate is largely responsible for the volcanoes that dot the Pacific Northwest of the United States. The plates make up Earth's outer shell, called the lithosphere. (This includes ...

From the waters of an Arctic archipelago all the way to the Southern Ocean and marine waters in between, these photos show ...

A menacing 50-degree slope and 9,000 feet straight down: that’s the terrain American mountaineer Jim Morrison tackled when he ...