The ancient cores of Earth’s continents are called cratons. Shaped like inverted mountains, they can stretch as deep as 200 miles (320 km) through the Earth’s crust and into its mantle; geologists refer to their deepest sections as ‘roots.’ According to new research published in the journal Geochemistry, Geophysics, Geosystems, cratonic roots may contain 1 to 2 vol.% diamond. Considering the total volume of cratonic roots, the study authors...
