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

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

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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
infrared rays from the sun
None of these

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