Geologist Gerard Bond noticed that some of the sediment grains were stained with iron oxide, evidence that they originated in locales where glaciers had overrun outcrops of red sandstone.

地质学家杰拉德·邦德注意到，一些沉积物颗粒被氧化铁染色，这表明它们起源于冰川覆盖红砂岩露头的地方。

youdao

Hematite is an iron oxide that is deep red in color.

赤铁矿是一种具有深红颜色的氧化铁。

youdao

The soil moisture, organic matter and iron oxide have a considerable effect on the red soil spectrum.

土壤中水分、有机质和氧化铁的含量对其光谱特征有很大影响。

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The red color is the result of iron oxide or rust.

VOA: special.2009.04.15

"Typically the concentrations are small in red mud and what is present is tightly bound to the particles of iron oxide, " he says.

BBC: How toxic is Hungary's red sludge?