write a summay of chapter 18 class 8 pollution of air and water
Answers
Air pollution is the introduction of pollutants, organic molecules, or other hazardous substances into earth’s atmosphere.
Sources:
a) Natural – forest fire, dust storms, and volcanic activity
b) Man-made – power plants, homes, industries, oil refineries, and transportation
Effects:
Causes allergies, diseases and even death to humans.
Causes birth defects in new-born babies.
Endangers animal health and welfare of plants and vegetation.
Water pollution is the contamination of water bodies with harmful waste.
Causes:
Urbanization
Industries
Agriculture
Religious and Social Practices etc.
Water Pollution
Not so Holy Ganga
Water Pollutants
The substances that pollute water are called water pollutants.
Examples: Detergents, chemicals dumped by hospitals, Insecticides and herbicides etc.
Effects of Water Pollution on the River Ganga
Towns and cities, through which the river flows, throw large quantities of garbage, untreated sewage, dead bodies, and many other harmful things, directly into the river.
Pollution in Ganga is choking the aquatic life and hindering the growth of plants.
Ganga is one of the ten most endangered rivers in the world.