World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
ultraviolet rays from the sun
None of these
infrared rays from the sun

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World Geography
The relative abundance of dissolved salts in seawater in descending order is as follows

chlorine, magnesium, calcium, sodium, potassium, sulphate
chlorine, sodium, magnesium, calcium, potassium, sulphate
sodium, chlorine, magnesium, potassium, sulphate, calcium
chlorine, sodium, sulphate, magnesium, calcium, potassium

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

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

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