46.6%
Oxygen in Earth's Crust Composition
The Earth's crust is primarily composed of silicate minerals. Oxygen is the most abundant element by weight in the Earth's crust.
Elemental Composition by Weight
The approximate distribution of the major elements by weight in the Earth's crust is as follows:
| Element | Approximate Percentage by Weight |
|---|---|
| Oxygen (O) | $46.6\%$ |
| Silicon (Si) | $27.7\%$ |
| Aluminum (Al) | $8.1\%$ |
| Iron (Fe) | $5.0\%$ |
| Calcium (Ca) | $3.6\%$ |
| Sodium (Na) | $2.8\%$ |
| Potassium (K) | $2.6\%$ |
| Magnesium (Mg) | $2.1\%$ |
| Others | $\approx 5.5\%$ |
Conclusion on Oxygen Percentage
Based on the standard composition of the Earth's crust, oxygen accounts for approximately $46.6\%$ of its weight, making it the most abundant element.
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