有很多沙粒是红色的,这是由于其表面有一层薄薄的铁,这些铁元素来自于空气中。
Many desert sands have a faint red color caused by a thin layer of iron that precipitates from the atmosphere and coats the grains. (Magnification 85x)
有很多沙粒是红色的,这是由于其表面有一层薄薄的铁,这些铁元素来自于空气中。
Many desert sands have a faint red color caused by a thin layer of iron that precipitates from the atmosphere and coats the grains. (Magnification 85x)
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