1. oxygen, 46.6 percent by weight;
2. silicon, 27.7 percent,
3. aluminum, 8.1 percent,
4. iron, 5 percent,
5. calcium, 3.6 percent,
6. sodium, 2.8 percent,
7. potassium, 2.6 percent,
8. magnesium, 2.1 percent
also check what is the composition in air.
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