Question #b7e83

1 Answer
May 18, 2015

Mars is made of much the same substances as Earth.

The percentages are different, but Mars has a central core of metallic iron and nickel surrounded by a mantle and crust that consists of silicates, metals, and other components of rocks.

The most abundant elements in the Martian crust are silicon, oxygen, iron, magnesium, aluminum, calcium, and potassium.

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The red colour of Mars is caused by the oxidation of iron on its surface.

Less abundant elements are titanium, chromium, manganese, sulfur, phosphorus, sodium, and chlorine .

The atmospheric pressure on Mars is only about 1 kPa.

Its composition is 95.3 % #"CO"_2#; 2.7 % #"N"_2#; 1.6 % #"Ar"#; 0.1 % #"O"_2#; 0.1 % #"CO"#; plus small amounts of other gases.