Earth: About 71% of the surface is covered in water, There is plenty of oxygen to breathe, The average surface temperature is around 14 degrees celsius, Has an atmosphere made of oxygen, nitrogen and argon gases which protect the planet, Has around 1350 active volcanoes, Was hit by an asteroid around 66 million years ago which killed off 70% of all life on the planet, There are around 128 confirmed impact sites on the surface of the planet, Mauna Loa is the biggest volcano on this planet, Mars: There is a crater deep enough to fit Mount Everest in, There is an ancient, inactive volcano, the biggest in the Solar System, called Olympus Mons , The surface temperature is freezing at around -60 degrees celsius, Has a thin atmosphere so heat from the Sun is easily lost from the surface, Has no active volcanoes, There was water on the planet around 4 billion years ago, The atmosphere is mainly carbon dioxide, not enough oxygen to breathe, About 20% of all craters in the Solar System are found on this planet,

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