World Geography
The meridian passing through London is called the

Tropic of Capricorn
equator
Prime Meridian of 0° Meridian
Tropic of Cancer

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

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