Multiple choice

In the hydrosphere, ocean water unsuitable for human use is

  1. 92%

  2. 94%

  3. 96%

  4. 97%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Of all water on Earth, about 97.5% is saline ocean water unsuitable for drinking or irrigation without desalination. Only about 2.5% is freshwater, and most of that is locked in glaciers or groundwater. This makes approximately 97% of ocean water unusable for direct human consumption.

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