What is the most abundant metal of the earth's crust?
magnetite
calcium
copper
aluminum
Metals represent approximately 25% of the elemental makeup of the Earth's crust. The bulk of these metals, primarily aluminum, iron, calcium, sodium, potassium, and magnesium, are typically found in combined form. The most abundant metal is aluminum, which occurs almost exclusively as the ionic mineral bauxite. The other most common metals, including iron, sodium, potassium, magnesium, and calcium, are also found primarily as the cationic portion of an ionic compound. Very few metals actually occur naturally as pure substances. The ones that do are often referred to as precious or semi-precious metals.