A long-lost tectonic plate that once underpinned what is today the South China Sea has been rediscovered 20 million years after disappearing.  The plate is known only from a few rock fragments from the mountains of Borneo and the ghostly remnants of its huge slab detected deep in Earth’s mantle. It was once a quarter … تابع قراءة Scientists discover ghost of ancient mega-plate that disappeared 20 million years ago