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The approximate circumference of the Earth is
Spot the odd item in the following:
Masses-of-stars-and-galaxies-are-usually-expressed-in:
When Granite rocks get metamorphosed, they form:
Which amidst the following planets has its orbit closest to Sun?
Which is the most stable eco-system?
Which one of the following is the indirect use of forests?
A place where there is constant intermingling of salt water and fresh water is
Ozone-hole in the atmosphere is largely caused by the presence of:
The number of zodiacs is: