How ancient oceans of magma may have boosted Earth’s oxygen levels
Chemical reactions involving iron could have increased oxygen-rich compounds in the mantle
![Earth illustration](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/08/082919_mt_mantle-oxidation_feat.jpg?fit=1028%2C579&ssl=1)
Iron-containing compounds in the magma oceans of early Earth (illustrated) may have helped create the planet’s oxygen-rich, life-sustaining atmosphere.
Simone Marchi, NASA