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为什么火星是红色的？

火星表面上有大量的铁氧化物，即红色的氧化铁，导致其呈现红色。火星的土壤富含铁元素，当这些铁氧化物曝露在空气中并与火星上的灰尘颗粒相互作用时，就会形成红色的表面。此外，火星大气中的氧化铁颗粒也会使火星呈现红色的外观。

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