Question

Why Mars is called red planet?​

Answer 1

Mars is often called the 'Red Planet' because it appears in the sky as an orange-red star. The colour caused the ancient Greeks and Romans to name it after their god of war. Today, thanks to visiting spacecraft, we know that the planet'sappearance is due to rust in the Martian rocks.
Hope it may be helpful

Answer 2

its soil has high iron content which gives a reddish appearance