Asound that's produced by a single wave at a constant frequency and with no overtones is called
a. a pure sound.
b. a mellow sound.
c. an average sound.
d. a discordant sound.

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.