the surface of the earth is made of 70% ocean
composition_of_earth is 28_percent_oxygen. earth's_surface is 70_water. earth has surface earth has atmosphere composition_of_earth is 2.7_percent_nickel. earth is 35_percent_iron. composition_of_earth is 0.4_percent_aluminum. composition_of_earth is 13_percent_silicon. composition_of_earth is 35_percent_iron. composition_of_earth is 12.7_percent_nickel.