Earth's plumbing system may have begun working billions of years before we thought, with ancient volcanic rocks hinting that the planet was already recycling water deep underground during an era we assumed was geologically simpler.
Pillow lavas look like a heap of stone beanbags, slumped one over another where molten rock hit cold seawater and stiffened on the spot. The ones exposed across a stretch of Western Australia’s Pilba… [+5697 chars]