13. Which is the most abundant element in the Earth's crust?
➱ Oxygen 47%
14. Which elements make up three-fourth of the Earth's crust?
➱ Oxygen and Silicon
15. Where would be Carbon, hydrogen, and sodium be included?
➱ These tree elements were included on the other's group (9%)
16. Which two elements together are equal to the amount of aluminium in the Earth's crust?
➱ Calcium and Iron
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13. Which is the most abundant element in the Earth's crust?
➱ Oxygen 47%
14. Which elements make up three-fourth of the Earth's crust?
➱ Oxygen and Silicon
15. Where would be Carbon, hydrogen, and sodium be included?
➱ These tree elements were included on the other's group (9%)
16. Which two elements together are equal to the amount of aluminium in the Earth's crust?
➱ Calcium and Iron