CBSE Class 8 Science Chapter 18 Revision Notes

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CBSE Class 8 Chapter 18 Pollution of Air and Water Revision Notes

 

CBSE Class 8 Science Chapter 18 Pollution of Air and Water Revision Notes are by far the best and most reliable Revision Notes for Sound. These CBSE Class 8 Science Chapter 18 Pollution of Air and Water Revision Notes provided here are prepared by our subject experts at Swiflearn to help students to recall important concepts and points related to Chapter 18 Pollution of Air and Water of CBSE Class 8 and in turn, enhance their confidence.

CBSE Class 8 Science Chapter 18 Pollution of Air and Water Revision Notes will surely make your learning convenient & fun. Students can download CBSE Class 8 Maths Chapter 18 Pollution of Air and Water Revision Notes in PDF format, use them to retain their previously learned concepts, and hence, ensure better examination results for themselves.

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Air Pollution

Air is the most important element for any living thing to survive. We find air around the earth in the form of a blanket which is known as the atmosphere. This air is a mixture of various gases. As a matter of fact, it is made of 78% nitrogen, 21% oxygen, and 1% of other gases. When the air gets contaminated by unwanted substances which have a harmful effect on living and non-living things, it is known as air pollution.

 

Water pollution

Water pollution can be defined as the addition of undesirable substances into the hydrosphere. Here are some of the water pollutants that are either man-made or naturally occurring and their harmful effects.

 

Effects of pollution on Taj Mahal

 

Mathura oil refinery, rubber processing, automobile, and chemical industries around Agra release pollutants like SO2, NO2, and soot particles. The oxides dissolve in rainwater and form acid rain which corrodes the marble (Marble cancer); the soot particles cause yellowing of marble.

 

Effects of pollution on River Ganga

 

The huge amount of dumping of human wastes is one of the major reasons of the pollution of river Ganga. All the industries around this river dump their wastes in Ganga which causes a huge amount of pollution.

 

Greenhouse effect and global warming

 

Some gases like CO2, methane, and water vapor do not allow heat to escape from the atmosphere, causing an increase in the temperature. This leads to global warming resulting in the melting of glaciers and ice caps and affects aquatic life and vegetation. Deforestation increases an amount of CO2 (trees use CO2 for photosynthesis and if they are cut down, CO2 remains unused) and thus contributes to the greenhouse effect.

 

CBSE Class 8 Chapter 18 Pollution of Air and Water Revision Notes PDF

 

Pollution Of Air And Water

 

 

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