Question

Why is mars called red planet?

Answer 1

Mars has been given the moniker "the Red Planet" because it has a bright red color. This reddish colors probably marks the areas that are like deserts on the Martian landscape; the grayish areas are the liquid parts............ 

Answer 2

Its basically by the greek god of war and its colour appears to be orange red.!! hence its a red planet but the colour is caused by the great martian rocks..
                                                        Peace..!!