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

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

North America
Western Europe
Eastern Asia
South east Asia

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