Giant Magma Ocean Once Swirled Inside Early Earth

An ancient ocean of magma once existed on top of Earth's core, new experiments suggest. This research could help explain puzzling findings seen deep within the Earth, researchers said. Previous calculations suggested a giant ocean of magma, or molten rock, might have existed in the lowermost part of Earth's mantle layer between the core and crust from very early in our planet's history, from about 4.5 billion years ago to at least about 2.5 billion years ago.