Frequently Asked Questions (FAQ's)
Question: 
What is noise?
  Answer: Noise is a sound, that is not desired to be heard.
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Question: 
What is water?
  Answer: Water is a clear liquid composed of hydrogen and oxygen = H2O.
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Question: 
How much water is on the surface of the Earth?
  Answer: 71 Percent of the Earth's surface is covered with water.
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