These compounds are iron oxides.
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The color change on Mars' surface observed from Earth is mainly caused by the presence of iron oxide, also known as rust, which gives the planet its distinctive reddish hue. Dust storms can also contribute to changes in color by affecting the distribution of dust and sediment on the surface.
The planet is Mars. Iron in the soil oxidizes, creating iron oxide, also known as rust, which gives the Martian surface its characteristic red color.
A tanish color
The planet Uranus is known to change color. Its cyan color is due to the presence of methane gas in its atmosphere. As the planet orbits the sun, different concentrations of methane cause it to appear to change color from greenish-blue to a more turquoise hue.
The verb in the sentence is "is." It is a linking verb that connects the subject "the red color of Mars" with the predicate "from rust."