Oxygen and Silicon together comprise approximately ______ %of the earth crust?
Correct answer: C. 75 %
- A. 64 %
- B. 79 %
- C. 75 %
- D. 73 %
Explanation
Oxygen makes up about 46.6% and silicon about 27.7% of the Earth’s crust by weight, giving a combined value near 74%, conventionally rounded to 75%.
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