Ranked: The Top 20 Metals and Mining Billionaires
Aluminum oxide (Al2O3), aluminum hydroxide (Al(OH)3) and potassium aluminum sulphate (KAl(SO4)2) are common aluminum compounds. Aluminum and aluminum alloys have a variety of uses, from kitchen foil to rocket manufacturing. #4: Iron. The fourth most common element in the Earth's crust is iron, accounting for over 5% of the mass of the Earth ...
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