World Geography
The longest ship canal in the world is the

Kiel canal, Germany
St. Laurence Seaway (USA and Canada)
Suez canal, Egypt
Panama canal, Central America

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

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

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