Practice Quiz

Green Plumbing - Question List

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116. Which of the following terms describes a recirculating system design strategy that uses shower drain water to pre-warm the cold water moving to the showerhead?
  1. Water temperature reclamation
  2. Parallel drain delivery
  3. Drain water heat recovery
  4. None of the above
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117. How much water does Earth contain altogether?
  1. 82.2 quadrillion gallons
  2. 326.0 million cubic miles (mi3)
  3. 904.5 million cubic miles (mi3)
  4. 874.3 trillion gallons
See answer
118. Approximately how much fresh water worldwide is stored in the ground (first number) and in glaciers and ice caps (second number), in millions of cubic miles?
  1. 7 and 2
  2. 2 and 7
  3. 1 and 3
  4. 3 and 1
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119. What percentage of Earth’s total water amount is saline?
  1. More than 97%
  2. About 80%
  3. About 67%
  4. Less than 52%
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120. What are the two most prevalent sources of fresh water on Earth?
  1. Ice caps/glaciers/permanent snow
  2. Lakes
  3. Groundwater
  4. Rivers
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