The most abundant metal in the earth crust is___.

The correct option is A

Al

The most abundant metal in the earth crust is aluminium. Although aluminum is the most abundant metal in the earth's crust, it is never found free in nature. All of the earth's aluminum has combined with other elements to form compounds. Two of the most common compounds are alum, such as potassium aluminum sulfate ($KAl(S{O}_4{)}_2\cdot 12H_{2}O$), and aluminum oxide ($A{l}_2{O}_3$). About 8.2% of the earth's crust is composed of aluminum.