Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?
A
Silicon
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B
Oxygen
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C
Carbon
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D
Calcium
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Solution
The correct option is B Oxygen Oxygen is by far the most abundant element in the earth's crust. Scientists estimate oxygen comprises nearly half of the mass of the crust. It also accounts for 21 percent of Earth's atmosphere