Multiple choice

What percent of total water present on earth is in continuous circulation?

  1. One percent

  2. Three percent

  3. Two percent

  4. Four percent
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Approximately one percent of Earth's total water is actively participating in the hydrologic cycle at any given time. The vast majority (over 97%) is saline ocean water, while most freshwater is locked in glaciers, ice caps, and groundwater. Only a small fraction circulates through evaporation, precipitation, and runoff, sustaining all terrestrial and freshwater life. This cycling portion is essential for ecosystem function and human use.

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