Multiple choice

The average salinity of sea water is _____.

  1. 2.0%

  2. 2.5%

  3. 3.0%

  4. 3.5%

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The average salinity of seawater is approximately 3.5%, meaning about 35 grams of dissolved salts per kilogram of seawater. This value varies slightly by location (near river mouths vs. open ocean), but 3.5% is the standard accepted average.

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