The oceans occupy an area of 1370 million km3. Average salinity is 35 ‰. Calculate how much salt is in the oceans and how much

The oceans occupy an area of 1370 million km3. Average salinity is 35 ‰. Calculate how much salt is in the oceans and how much salt is there per inhabitant of the planet.

1) Let’s make the proportion:
1 km3 (35 ‰) – 35 million tons of salts
1370 million km3 (35 ‰) – X t salts
X = 1370 × 10 ^ 6 km3 × 35 × 10 ^ 6 t = 4795 × 10 ^ 13 tons of salts – contained in the World Ocean.
2) The population of the Earth ≈ 6 billion people. Let’s find how much salt is per person:
4795 × 10 ^ 13 tons of salts: 6 × 10 ^ 9 people = 799.17 × 10 ^ 4 tons / person. ≈ 8 million tons / person
Answer: the World Ocean contains 4795 × 10 ^ 13 tons of salts, and about 8 million tons of salts per inhabitant of the planet.

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