Earth’s water originated close to home, lava analysis suggests
Deuterium levels in mantle argue against comets as H2O source
![volcanoes](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/11/111215_ts-primorfial-water_free.jpg?fit=860%2C460&ssl=1)
WATERY WORLD Water molecules embedded inside lava spewed by volcanoes in Iceland (like the one shown) and Canada suggest that Earth’s H2O originated from water-laden dust.
Magnús Tumi Guðmundsson