The eight most common elements in Earth's continental crust, by weight percentage, are:

1. Oxygen (O): 46.6%

2. Silicon (Si): 27.7%

3. Aluminum (Al): 8.1%

4. Iron (Fe): 5.0%

5. Calcium (Ca): 3.6%

6. Sodium (Na): 2.8%

7. Potassium (K): 2.6%

8. Magnesium (Mg): 2.1%

These eight elements make up over 99% of the Earth's continental crust.