Question

Classify the given sources of water pollution as natural and man-made
(i) Domestic waste
(ii) Dead animals
(iii) Oil spills
(iv) Ashes released due to forest fires.

Answer 1

Hint: water pollution is a type of environmental pollution. Environmental pollution can be defined as the contamination of the environment with harmful wastes arising mainly from human activities. It can be caused by chemical agents ,physical agents and biological agents(microorganisms).

Complete step by step answer:
Water pollution is the contamination of water bodies by the various pollutants . It is caused by microorganisms, organic wastes, plant nutrients, toxic heavy metals etc. Water bodies include lakes, rivers, oceans and groundwater. Water pollution results when contaminants are introduced into the natural environment
Let us categorize above sources of pollutants into the man-made and natural pollutants.
Natural pollution: when the contamination in the environment is caused by natural pollutants, the pollutants created by substances of natural origin such as volcanic dust, sea salt particles, photochemically formed ozone, and products of forest fibers, etc
Man-made pollution: when the contamination in the environment is due to human created pollutants such as industrial waste, chemical hazards, smoke from the vehicles and mining etc. usually the man made pollutants are the main cause of the deteriorating state of the environment.
Domestic waste is classified under man-made pollution because
Household waste, also known as domestic waste or residential waste, are disposable materials generated by households. This waste can be non-Hazardous waste and Hazardous waste. Waste can include food scraps, paper, bottles, etc. which can be recycled or composted. Domestic waste mainly includes kitchen scrap, vegetable peels and dust from the homes.
The dead animal is classified under natural pollution because
Dead animals which on the burial of it may lead to exclusively local contamination of groundwater by nitrogen species and dissolved organic matter in the dead body. contamination of soil can be caused due to decaying of animals.
Oil spills are classified under man-made pollution because an oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity, and oil may also spill on land. It is the factories and industrial waste that is responsible for major oil spills. The gases trapped in oil due to incomplete combustion is a threat to marine life as it decreases the amount of oxygen in water bodies.
Ashes released due to forest fires are classified under natural pollution
Ashes from the forest fire release a lot of lethal and toxic gases such as carbon monoxide, nitrogen etc.Ash contains high qualities of Heavy metal that depend on combusted species, type and part burned. After a fire, the Heavy metal released from ash can lead to soil pollution and water resources contamination.

Note:
The contamination that is happening of the natural resources by various pollutants is called pollution and is mainly caused by human activities that harm the environment.