A layer of searing hot liquid magma trapped since Earth's formation may lie 1,800 miles (2,900 kilometers) beneath our feet, new research suggests. The finding backs up theories that Earth's solid ...

Scientists aim to drill Earth's mantle and get samples for the first time—a feat as important, and hard, as the Apollo program, they say. Ship workers for Project Mohole, a failed attempt to ...

Earth’s innermost layer is a 400-mile-wide ball of iron, ... a seismologist and postdoctoral fellow at the Research School of Earth Sciences at the Australian National University in Canberra, ...

His team also hoped to solve another, much more obscure mystery: why the rocky outer layers of the planet have an odd mix of two rare-earth elements called samarium and neodymium.