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The most abundant element on earth crust is
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The correct answer is:
Oxygen
$\begin{array}{lc}
\text { Element } & \text { % abundance by weight } \\
\mathrm{O} & 46.6 \\
\mathrm{Si} & 27.7 \\
\mathrm{Al} & 8.3 \\
\mathrm{Fe} & 5.1 \\
\mathrm{Ca} & 3.6
\end{array}$
\text { Element } & \text { % abundance by weight } \\
\mathrm{O} & 46.6 \\
\mathrm{Si} & 27.7 \\
\mathrm{Al} & 8.3 \\
\mathrm{Fe} & 5.1 \\
\mathrm{Ca} & 3.6
\end{array}$
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