the earth 's atmosphere is made of 23133 percent oxygen by mass
composition_of_earth is 35_percent_iron. composition_of_earth is not 28_percent_oxygen. composition_of_earth is 0.4_percent_aluminum. earth's_atmosphere has oxygen oxygen is gas_at_1_atmosphere. earth is 35_percent_iron. earth is not 35_percent_iron. composition_of_earth is not 35_percent_iron. earth's_atmosphere has not oxygen composition_of_earth is 28_percent_oxygen.