Which one of the following is present in the largest amount in terms of per cent by man In the earth's crust?
A. Silicon
B. Oxygen
C. Carbon
D. Calcium
Answer: Option B
A. Silicon
B. Oxygen
C. Carbon
D. Calcium
Answer: Option B
The years 1700, 1800 and 1900 were
A. Leap years
B. Not leap years
C. Famine years
D. Years of natural calamities
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