To understand the mantle—the largest layer of Earth’s rocky body—scientists drill deep cores out of the Earth. Scientists ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

To understand the mantle—the largest layer of Earth’s rocky body—scientists ... pristine mantle that lies beyond the Mohorovičić discontinuity, or Moho, boundary. If you want to understand ...