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What percentage of the earth's water is fresh water?
What percentage of the earth's water is fresh water?
Which of the following is the largest source of fresh water for human use?
Which of the following is the largest source of fresh water for human use?
What percentage of the earth's water is salt water?
What percentage of the earth's water is salt water?
What is the primary cause of contamination of drinking water mentioned in the text?
What is the primary cause of contamination of drinking water mentioned in the text?
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Where is the majority of the fresh water on earth located?
Where is the majority of the fresh water on earth located?
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