What is the main source of silicon?

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Tags

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2. #second
3. #earth
4. #abundant
5. #widely
6. #planets
7. #making
8. #forms
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11. #various
12. #sands
13. #element
14. #crust
15. #distributed
16. #oxygen
17. #dioxide
18. #dusts
19. #silicates
20. #silicate
21. #about
22. #minerals
23. #composed
24. #after