Sources Of Water Pollution. 1  Dumping of industrial wastes, containing heavy metals, harmful chemicals, by-products, organic toxins and oils, into the nearby source of water is one of the visible causes of water pollution.  Another cause for the contamination of water is the improper disposal of human and animal wastes.
Also see audio noise. Noise is unwanted electrical or electromagnetic energy that degrades the quality of signals and data. Noise occurs in digital and analog systems, and can affect files and communications of all types, including text, programs, images, audio, and telemetry.
In the above diagram of elements of the communication process, the communicator is the encoder, the message is symbol (verbal or non-verbal), the channel is one of the transmission medium, the receiver is the decoder, feedback is the response to the message, and noise is any interruption that breaks down the communication.