Recycling metals, including iron, helps the country's sustainable development.
Less than ten percent of crude oil extracted is used to produce fibers, fabrics, and detergents.
The amount of metallic minerals such as iron and nickel in ocean floor reserves is more than their reserves on land.
In iron extraction, the mass ratio of ``iron ore'' used to the mass of ``other mineral resources'' consumed is approximately 2.
\textbf{86 --} Which statement is incorrect?
\begin{enumerate}
\item Recycling metals, including iron, helps the country's sustainable development.
\item Less than ten percent of crude oil extracted is used to produce fibers, fabrics, and detergents.
\item The amount of metallic minerals such as iron and nickel in ocean floor reserves is more than their reserves on land.
\item In iron extraction, the mass ratio of ``iron ore'' used to the mass of ``other mineral resources'' consumed is approximately 2.
\end{enumerate}