Elemental Composition of Crust
| Element | Composition of crustal rocks |
| Oxygen | 46.2% |
| Silicon | 27.7% |
| Aluminum | 8.1% |
| Iron | 5.0% |
| Calcium | 3.6% |
| Sodium | 2.8% |
| Potassium | 2.5% |
| Magnesium | 2.1% |
| Other elements | 1.7% |
| Total | 100% |
posted at 1/22/2007 09:11:00 AM
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