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>Natural quiet is an interesting term. Assuming it is >the natural state of the park without human presence, >then even a hiker disturbs natural quiet. Does the >term natural quiet capture human footsteps, talking, >breathing? What if natural quiet is actually loud -- >the rushing of a waterfall -- does the natural masking >sound produced that covers say the sound of an >airplane above mean that natural quiet is achieved in >that area?

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