Geographical Perspective Test - 2

Major industries causing water pollution are leather, paper and pulp, textiles and chemical industries.

Sources of water pollution are sewage disposal, urban run-off, toxic effluents from industries, run-off over cultivated lands and nuclear power plants.

High level of noise above tolerance level is called noise pollution. Sources of pollution are aircrafts, automobiles, trains, industrial processing and advertising media.

Air pollution can also cause acid rains. It is caused by airborne acidic pollutants and has highly destructive results.

Cities of Kanpur, Allahabad, Varanasi, Patna and Kolkata release domestic waste into the Ganga river.

Air pollution  consists of chemicals or  particles in the air that can harm the health of humans, animals, and plants. They can be gases, solid particles, or liquid droplets.

Though water pollutants are also created from natural sources (erosion, landslides, decay and decomposition of plants and animals, etc.) pollutants from human sources are the real causes of concern. Human beings pollute the water through industrial, agricultural and cultural activities.

India, which has a predominance of rural population had about 72 percent of the total population in 2001 in villages. Most of the rural areas are still performing primary activities.

Surface water available from rivers, canals, lakes, etc., is never pure. It contains small quantities of suspended particles, organic and inorganic substances.

Biotic components include living things like flora, fauna, human beings etc., whereas a biotic components include non living things like soil, water, air, land, etc.