World Geography
The infrared radiation by sun are strongly absorbed by

water vapours
ozone
carbon dioxide
carbon dioxide and water vapours

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World Geography
The period of daylight

is nearly constant near the equator
All of these
varies with latitude and the season
reaches a maximum of 24 hour in the polar zones in summer

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

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