Answer:
Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps.
Explanation:
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I believe the answer is a.
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The only one i can see caused primarily by human activities would be A. Air Pollution.
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