Mars
It isn't. Mars is called the red planet, because it's crust is rich in compounds of the element iron, many of which are reddish colored. Venus is yellowish in color, a result of its thick atmosphere.
Mars is nicknamed the Red Planet because of the high levels of iron oxide on the surface of the planet. Iron Oxide is also known as rust.
because the the is a lot of iron in the ground and it has started to rust giving it that red colour
The planet Mars is widely known as "the red planet", because of the rusted supply of iron oxide in its soil.
Mars is the planet known as the red planet
Mars is viewed as the red planet because of the large amounts of iron oxide on the surface
Mars is the Red Planet because the Iron Oxide in the surface is what gives it it's reddness.
It's chemical IRON. [Iron Oxides]
Mars is known as the red planet. This is because the iron in the soil gives it a red color. Mars is thought to have once had lakes and oceans.
Mars
mars because mars is red
Mecury is not called the red planet. Mars is called the red planet because of the iron oxide (rust) in it's soil, making the planet look red. Yes, Venus is the hottest planet but it is not called the red planet.