NCERT Class 8 Science Chapter 18: Pollution Of Air And Water (NSO/NSTSE) | English
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Dr. Manishika Jain explains NCERT
Dr. Manishika Jain explains NCERT Class 8 Science Chapter 18: Pollution Of Air And Water
SOF NSO Class 8 - https://www.doorsteptutor.com/Exams/NSO/
Unified Council NSTSE Class 8 Preparation - https://www.doorsteptutor.com/Exams/N...
Handouts @ https://www.examrace.com/Study-Materi...
Respiratory diseases
Air is essential – we need clean air
78% is nitrogen; 21% is oxygen
When air is contaminated by unwanted substances which have a harmful effect on both the living and the non-living, it is referred to as air pollution.
Petroleum refineries are a major source of gaseous pollutants like sulphur dioxide and nitrogen dioxide. Sulphur dioxide is produced by combustion of fuels like coal in power plants. It can cause
respiratory problems, including permanent lung damage
Chlorofluorocarbons (CFCs) which are used in refrigerators, air conditioners and aerosol sprays. CFCs damage the ozone layer of the atmosphere.
Automobiles which burn diesel and petrol, also produce tiny particles which remain suspended in air for long periods. They reduce visibility.
Power plants give out tiny ash particles which also pollute the atmosphere
A part of the radiation that falls on the earth is absorbed by it and a part is reflected back into space. A part of the reflected radiation is trapped by the atmosphere. The trapped radiations further warm the earth
The trapped heat warms the green house. The trapping of radiations by the earth’s atmosphere is similar. That is why it is called the greenhouse effect
CO2 is constantly been released and area under forest is decreasing – it increases CO2 in atmosphere
the average temperature of the earth’s atmosphere is gradually increasing. This is called global warming.
Greenhouse gases - methane, nitrous oxide and water vapour - control it by Kyoto Protocol
Air Pollution @0:51 1:03
Smoke from a Factory & Air Pollution Due to Automobiles @2:47
Smog @4:43
@8:30
Green House Effect @8:30
Global Warming @9:46
Air Quality Index @11:26
Children Planting Sapling @12:07
Water Pollution @13:30
Point Source Water Pollution @14:30
Non Point Source Water Pollution @15:07
Course of the River Ganga @15:21
A Polluted Stretch of the Ganga @15:27
Water Treatment Plant @16:29
#Treatment #Quality #Global #Warming #Wheezing #Smoke #Factory #Automobile #Contamination #Pollution #Manishika #Examrace #NSO #NSTSE #Olympiad #NCERT #VVM #examrace #upsc #ugcnet
SOF NSO Class 8 - https://www.doorsteptutor.com/Exams/NSO/
Unified Council NSTSE Class 8 Preparation - https://www.doorsteptutor.com/Exams/N...
Handouts @ https://www.examrace.com/Study-Materi...
Respiratory diseases
Air is essential – we need clean air
78% is nitrogen; 21% is oxygen
When air is contaminated by unwanted substances which have a harmful effect on both the living and the non-living, it is referred to as air pollution.
Petroleum refineries are a major source of gaseous pollutants like sulphur dioxide and nitrogen dioxide. Sulphur dioxide is produced by combustion of fuels like coal in power plants. It can cause
respiratory problems, including permanent lung damage
Chlorofluorocarbons (CFCs) which are used in refrigerators, air conditioners and aerosol sprays. CFCs damage the ozone layer of the atmosphere.
Automobiles which burn diesel and petrol, also produce tiny particles which remain suspended in air for long periods. They reduce visibility.
Power plants give out tiny ash particles which also pollute the atmosphere
A part of the radiation that falls on the earth is absorbed by it and a part is reflected back into space. A part of the reflected radiation is trapped by the atmosphere. The trapped radiations further warm the earth
The trapped heat warms the green house. The trapping of radiations by the earth’s atmosphere is similar. That is why it is called the greenhouse effect
CO2 is constantly been released and area under forest is decreasing – it increases CO2 in atmosphere
the average temperature of the earth’s atmosphere is gradually increasing. This is called global warming.
Greenhouse gases - methane, nitrous oxide and water vapour - control it by Kyoto Protocol
Air Pollution @0:51 1:03
Smoke from a Factory & Air Pollution Due to Automobiles @2:47
Smog @4:43
@8:30
Green House Effect @8:30
Global Warming @9:46
Air Quality Index @11:26
Children Planting Sapling @12:07
Water Pollution @13:30
Point Source Water Pollution @14:30
Non Point Source Water Pollution @15:07
Course of the River Ganga @15:21
A Polluted Stretch of the Ganga @15:27
Water Treatment Plant @16:29
#Treatment #Quality #Global #Warming #Wheezing #Smoke #Factory #Automobile #Contamination #Pollution #Manishika #Examrace #NSO #NSTSE #Olympiad #NCERT #VVM #examrace #upsc #ugcnet
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