This graphic shows the thickness (in kilometers) of the North American lithosphere. The blue area is about 250 km thick and, based on new findings reported in Nature, is composed of a 3-billion ...

These deposits are situated on the Pilbara Craton, an ancient and stable part of Earth's crust. This piece of crust is one of two pieces that are part of Archaean Eon, which dates back 3.8 billion ...