Echos are caused when sound waves reflects off of a moderately even surface, such as a wall. The sound bounces back to you and you rehear the noise again.
Echoes only are noticeable under certain circumstances. The surface must be large enough to capture most of the sound. In order to hear the echo, all other sounds must be neutralized in some way, or none existant. And it takes more than simply one surface to reflect the sound. One surface is not enough for the necessary amplification.
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