An echo is an example of the type of wave interaction called

Explanation:

There are many types of wave interactions i.e. reflection, refraction, diffraction, interference etc.

An echo is an example of the type of wave interaction called reflection. It follows the laws of reflection. A sound wave strikes a surface, it strikes the surface and reflect back producing repeated sound called echo.  

Hence, echo is an example of reflection of sound.

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explanation:

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.