Pollution of water and air | class 8 worksheet

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Pollution of water and air | class 8 worksheet

Pollution of water and air. Download Pollution of water and air class 8 worksheets based on the latest syllabus including MCQ on Pollution of water and air, long questions, define the following, answer in one word, and more.

Points to remember

How does Air Get Polluted?

The substances which contaminate the air are called air pollutants. Sometimes such substances may come from natural sources like smoke and dust arising from forest fires or volcanic eruptions. Pollutants are also added to the atmosphere by certain human activities.

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.

Other kinds of pollutants are chlorofluorocarbons (CFCs) which are used in refrigerators, air conditioners, and aerosol sprays. CFCs damage the ozone layer of the atmosphere.

The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases.

Deforestation leads to an increase in the amount of CO2 in the air because the number of trees that consume CO2 is reduced. Human activities, thus, contribute to the accumulation of CO2 in the atmosphere. CO2 traps heat and does not allow it to escape into space. As a result, the average temperature of the earth’s atmosphere is gradually increasing. This is called global warming. Other gases like methane, nitrous towards this effect. Like CO2, they are also called greenhouse gases.

Whenever harmful substances such as sewage, toxic chemicals, silt, etc., get mixed with water, the water becomes polluted. The substances that pollute water are called water pollutants

An ambitious plan to save the river called the Ganga Action Plan was launched in 1985. It aimed to reduce the pollution levels in the river. However, the increasing population and industrialization have already damaged this mighty river beyond repair. Now, the Government of India has launched a new initiative known as National Mission for Clean Ganga (NMCG) in 2016.

oxide and water vapour also contribute

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