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why does the loudness of sound waves decrease at it covers more distance?

The sound pressure level (SPL) decreases with doubling of the distance by (−)6 dB. ... It drops with the ratio 1/r of the distance. The sound intensity level decreases with doubling of the distance by (−)6 dB.

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The energy in the sound's vibration dies down until it's no longer audible
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Sound is transfered to our years through the air molecules. The are molecules vibrate and pass the sound. The vibrations remain for only some distance. If it goes more then it loses power of vibrations which is why sound decreases as it gains distance.
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Asthe energy in the sound vibration dies
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