Which of the following best describes the availability of freshwater on Earth?
Which of the following is not an option for solving the world water crisis?
Which of the following best explains the importance of water to humans?
Which of the following human activities do not require water?
Most people in cities get their water _______.
The world’s supply of freshwater is increasing.
Which of the following is least likely to have difficulties with economic access to potable water?
The principle reason that most of North America and Europe do not have difficulties with access to potable water is their wealth.
The defining characteristic of potable water is that it _______.
Lakes and rivers constitute _______.
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