Scientists discover a new way mountains are formed – from ‘mantle waves’ inside the Earth

In 2005, I was navigating winding roads through the Drakensberg Mountains, in Lesotho, Southern Africa. Towering cliff-like features known as escarpments interrupt the landscape, rising up by a kilometre or more. Taken aback by the dramatic scenery, I was struck by a question: how on Earth did it form? The outer shell of our planet […]