Is_Mars_really_Red__

Rocks and soil on Mars mostly contain iron. Experts suggest that iron reacts with atmospheric oxygen, forming reddish iron oxide or rust on the surface, thus making Mars appear red.

However, on observing closely through rovers, some areas are brown, green, butterscotch-colored, etc. Still, overall, Mars appears red, because dust storms, which last for weeks or months, kick up the rust into the atmosphere giving it a reddish color.