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

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

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World Geography
Which among the following region has the highest density of rail network?

Western Europe
North America
South east Asia
Eastern Asia

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