A battered diamond that survived a trip from "hell" confirms a long-held theory: Earth's mantle holds an ocean's worth of water.
A diamond from Juína, Brazil, containing a water-rich inclusion of the olivine mineral ringwoodite. Credit: Richard Siemens/University of Alberta
"It's actually the confirmation that there is a very, very large amount of water that's trapped in a really distinct layer in the deep Earth," said Graham Pearson
, lead study author and a geochemist at the University of Alberta in Canada. The findings were published today (March 12) in the journal Nature.