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

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

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World Geography
In which rocks does most of the formation of caves take place?

Granite
Limestone
Quartzite
Sandstone

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