Sound (wave-like variations in pressure of air molecules) can be bounced off of any hard, (sound-)reflective material. Since sound does not travel infinitely fast (it goes about 761 mph), we hear a slight pause between the sound coming back to hit us from a nearby reflective material, compared to a reflective material that is farther away. The sound doesn’t have to travel as far to get back to our ears when it bounces of something close to the observed (that’s the first echo); and it takes a longer path, which requires more time in travel, to get to the farther sound-reflector and then be bounced back later (the second, quieter echo)… I hope that helps. helps. helps.
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