Cross-section of the Earth's interior: crust, upper- and lower-mantle, and outer- and inner-cores. Journalists may use this image only with appropriate credit.

The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in different parts of the Earth’s structure. The crust is made from enormous ...

This slab once formed part of the seafloor in the southeastern Pacific and could help explain a strange gap in the lowermost sections of the mantle — the middle layer of Earth's crust that wraps ...