About 50% of the Earth's crust, including the waters on the Earth and atmosphere, is?
Correct answer: A. Oxygen
- A. Oxygen
- B. Cabon Dioxide
- C. Silicon
- D. Clay
Explanation
Oxygen forms about 46% of the Earth's crust by mass, making it the most abundant crustal element. The figure is often rounded to about 50%, while carbon dioxide and clay are not elemental components in this sense.
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