(A) The abundance of elements in the earth's crust is as follows: $1$. Oxygen $(O)$: $\approx 46.6 \, \%$ $2$. Silicon $(Si)$: $\approx 27.7 \, \%$ $3

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(A) The abundance of elements in the earth's crust is as follows: $1$. Oxygen $(O)$: $\approx 46.6 \, \%$ $2$. Silicon $(Si)$: $\approx 27.7 \, \%$ $3$. Aluminum $(Al)$: $\approx 8.1 \, \%$ $4$. Iron $(Fe)$: $\approx 5.0 \, \%$ Since oxygen has the highest percentage by mass in the earth's crust,it is the most abundant element.