How is an echo formed?

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Tags

  1. #through
  2. #sound
  3. #especially
  4. #different
  5. #travels
  6. #material
  7. #hearing
  8. #absorbed
  9. #waveform
  10. #transmitted
  11. #echoes
  12. #vibrating
  13. #reflected
  14. #matter
  15. #straight