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.
Noise is a key factor in many electronic and radio frequency or RF circuits. Noise comes in many forms. It can be generated in many ways and noise can affect electronic and radio frequency, RF circuits and systems. These different types of noise may affect circuits in different ways, or they may need to be taken into account in different ways.