Discussion
The most abundant element on the Earth's crust is ............
Answer: C
The most abundant element in the Earth's crust is oxygen.
Oxygen makes up about 46% of the crust by weight, almost all bound in silicate and oxide minerals. Silicon is second at about 28%, aluminium third at about 8%, and iron fourth at about 5%.
Aluminium is the most abundant metal, and iron is the most abundant element of the Earth as a whole, because of the core. Both are traps when the question asks only about the crust.
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