Aluminum is the most common metal on Earth. It’s the most abundant metal on the surface of the earth, making up about 8 percent of the Earth’s crust. Aluminum is a very useful metal because it can conduct electricity very well and it also is able to insulate heat.
Aluminum is the most common metal in the crust, but not likely in the whole earth. Iron in the far more voluminous mantle and core add up to much more than aluminum. If the original question meant what is the most common metal used by people, that would also be iron in terms of volume. (But stone is the non-fuel mineral commodity used the most, volume-wise, and it is also the most valuable non-fuel mineral commodity mined in the US.)
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