World Geography
The ocean water is saline due to

volume of fresh water added by rainfall
salts are already present in sea water
both (a) and (b)
evaporation of its surface

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World Geography
Which among the following period in the demographic history of India is called the Period of Stable Population?

1981 to Present
1891 to 1921
1921 to 1951
1951 to 1981

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World Geography
The sidereal month may be defined as

the period in which the moon completes an orbit around the earth
the period of rotation of moon
None of these
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky

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