World Geography
The main dividing line between the geological regions of the Indo Gangetic plain and the peninsula is

the Satpwas
the Aravallis
the Nilgiri hills
the Vindhya range

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

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

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