World Geography
The imaginary line on the earth's surface, which closely follows the 180o meridian, is called the

Tropic of Cancer
Prime Meridian
Equator
International Date Line

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

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

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World Geography
The main objective of multi-purpose river projects are

All of these
power generation by constructing hydro power stations
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
flood controls and making rivers navigable

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