the earth 's atmosphere is made of 1288 percent argon by mass
composition_of_earth is 28_percent_oxygen. earth has atmosphere composition_of_earth is 2.7_percent_nickel. planet_earth has atmosphere earth is 35_percent_iron. composition_of_earth is 0.4_percent_aluminum. composition_of_earth is 17_percent_magnesium. composition_of_earth is 35_percent_iron. composition_of_earth is 13_percent_silicon. composition_of_earth is 12.7_percent_nickel.