The most abundant metal in earth's crust is _____.

Options

A. Al
B. O
C. Fe
D. Si

Answer

To determine the most abundant metal in the Earth's crust, we can analyze the options provided and their respective abundances:

1. **Oxygen**: Approximately 46.1% of the Earth's crust is made up of oxygen. However, oxygen is a non-metal, so it cannot be the answer to the question which asks for a metal.

2. **Silicon**: Silicon constitutes about 28.2% of the Earth's crust. Similar to oxygen, silicon is also a non-metal and therefore does not qualify as the answer.

3. **Aluminium**: Aluminium accounts for approximately 8.23% of the Earth's crust. This is a significant amount, and since aluminium is a metal, it is a candidate for the answer.

4. **Iron**: Iron makes up about 5.63% of the Earth's crust. While it is a metal, its abundance is lower than that of aluminium.

Now, comparing the percentages of the metals listed (aluminium and iron), we find that aluminium is the most abundant metal in the Earth's crust.

Thus, the answer to the question is:

**The most abundant metal in Earth's crust is Aluminium.**