Multiple choice general knowledge

The amount of gold in all the oceans together is estimated to be as much as -- thousand million tonnes.

  1. 9

  2. 10

  3. 11

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct answer is 10 thousand million tonnes. Scientific estimates suggest that seawater contains approximately 10-20 million tonnes of dissolved gold, which would be expressed as 10-20 thousand million tonnes. While this sounds like a lot, gold is so dilute in seawater (about 0.0000000001% by weight) that extraction is not economically viable with current technology.

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