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  1. What is Sound and How do we Hear it? - Let's Talk Science

  2. Sound - Wikipedia

  3. Production and Propagation of Sound - GeeksforGeeks

  4. What is sound and how is it produced? - Toppr

  5. Sound | Properties, Types, & Facts | Britannica

  6. What Is Sound? Vibration and the Propagation of Sound - BYJU'S

  7. Sound - The science of waves, how they travel, how we use them

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