The layers of the earth's crust are distinguished by their
A. Thickness and depth
B. Density and temperature
C. Metallic content and rocks
D. All the above
Answer: Option D
A. Thickness and depth
B. Density and temperature
C. Metallic content and rocks
D. All the above
Answer: Option D
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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