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Top 10 Most Common Elements in the Earth's Crust

1. Oxygen, 46.6% 2. Silica, 27.7% 3. Aluminum, 8.1%   4. Iron, 5.0% 5. Calcium, 3.6% 6. Sodium, 2.8% 7. Potassium, 2.6% 8. Magnesium, 2.1% 9. Titanium, .66% 10. Hydrogen, .15%