is mainly made of four elements: iron oxygen silicon and magnesium that make up more than 90% of the earth’s mass.
The earth is composed mostly of iron (32%) oxygen (30%) silicon (15%) and magnesium (14%).
There are other elements such as sulfur (3%) nickel (2%) calcium (1.5%) and aluminium (1.5%) with the remaining 1% consisting of trace amounts of other elements.
Earth’s atmosphere is nitrogen (78%) oxygen (21%) argon (0.9%) and carbon dioxide (0.03%) with very small percentages of other elements.
Earth’s crust is made up of oxygen (47%) silicon (27%) aluminum (8%) iron (5%) calcium (4%) and magnesium potassium and sodium (2%).
Earth’s mantle is composed mostly of silicate rocks rich in magnesium and iron.
Earth has a solid inner core of iron surrounded by a liquid outer core composed of a nickel-iron alloy.