what element makes up most of the mantle

The mantle is the mostly solid bulk of Earths interior, and it is composed of silicate rocky material with an average thickness of 2,886 kilometers. The major elements that make up the mantle are oxygen, silicon, and magnesium, which together account for about 89% of the mantles composition. Other elements found in the mantle include iron, aluminum, calcium, sodium, and potassium.