The Earth's crust is composed of various elements. Their abundance varies significantly, with some elements being much more common than others. We need to identify the most abundant metal from the given options.
Oxygen and Silicon are the most abundant elements overall, but they are non-metals. The question specifically asks for the most abundant metal.
Here's a comparison of the approximate abundance of the metals listed in the options within the Earth's crust (by weight):
| Metal | Approximate Abundance (%) |
| Aluminium | 8.2% |
| Iron | 5.0% |
| Calcium | 3.6% |
| Sodium | 2.8% |
| Potassium | 2.6% |
| Magnesium | 2.3% |
| Titanium | 0.57% |
| Manganese | 0.11% |
| Barium | 0.05% |
From the table, we can compare the abundance of the metals provided in the options:
Comparing these values, Aluminium clearly shows the highest percentage.
Therefore, Aluminium is the most abundant metal found in the Earth's crust among the given choices.
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