[MP PMT 1972, 80, 84; DPMT 1986]
A) Hydrogen
B) Oxygen
C) Silicon
D) Carbon
Correct Answer: B
| Element | % abundance by weight |
|---|---|
| O | 46.6 |
| Si | 27.7 |
| Al | 8.3 |
| Fe | 5.1 |
| Ca | 3.6 |
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