GEOLOGY

Detailed explanation-1: -The United States Environmental Protection Agency (EPA) defines point source pollution as any contaminant that enters the environment from an easily identified and confined place. Examples include smokestacks, discharge pipes, and drainage ditches.

Detailed explanation-2: -Pollution originating from a single, identifiable source, such as a discharge pipe from a factory or sewage plant, is called point-source pollution.

Detailed explanation-3: -Human activities that generate domestic sewage and toxic waste cause water pollution by contaminating water with disease-causing microorganisms and poisonous substances. Oil spills are another source of water pollution that have devastating impacts on surrounding ecosystems.

Detailed explanation-4: -The main point source of pollution to water is from sewage and waste water treatment, while for diffuse pollution, main sources are from farming and fossil fuel power plants (via the air).