the earth 's atmosphere is made of 78 percent nitrogen by mass
earths_atmosphere has nitrogen nitrogen is gas_at_1_atmosphere. composition_of_earth is 35_percent_iron. composition_of_earth is not 28_percent_oxygen. earth is 35_percent_iron. nitrogen is not gas_at_1_atmosphere. atmosphere is mostly_nitrogen. composition_of_earth is 12.7_percent_nickel. earths_atmosphere has not nitrogen composition_of_earth is 28_percent_oxygen.