It turned out that whatever the outer core is made of, it isn't an iron-oxygen mix.

出现的结果是无论外核是什么造就的，但它不是铁和氧的混合。

youdao

As a way of reconciling these two facts, scientists have hypothesized that nearly all of the oxygen being produced was taken up by iron on Earth's surface.

为了调和这两个事实，科学家们假设，几乎所有产生的氧气都被地球表面的铁吸收了。

youdao

Something in addition to the iron on Earth's surface must have absorbed much of the oxygen produced by plant life.

除了地球表面的铁以外，一定有什么东西吸收了植物产生的大量氧气。

youdao

He read about something called direct-reduced iron, a technique for smelting without melting--removing the oxygen from iron ore while it's still solid, that is.

FORBES: Carnegie would be jealous

Oxygen generators contain sodium chlorate and iron powder -- solid chemicals that are mixed and cast into a solid shape.

CNN: Expert: Oxygen generators should be safe as cargo

Upon exposure to water and oxygen, these minerals oxidize to form acid-, iron- and sulfate-rich drainage.

FORBES: Fracking With Bad Water