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CBSE Class 7 Science Syllabus 2024September 21, 2023
You have landed on the right page to learn and have an Introduction to Pollution. The problem of pollution has become very humourless today. Man has interfered too much with nature. As a result, the environment, which includes air, water, soil, etc., has been polluted. If the environment is polluted, life on Earth will also be affected directly or indirectly. Day by day, due to anthropogenic actions, our atmosphere is becoming more and more polluted.
This is usually due to the pollutants released into the atmosphere through many human activities. Ozone depletion, skin cancer, hearing loss, loss of eyesight, pulmonary problems, etc., are caused because of pollution. So let’s explore more about pollution, its types and its adverse effects on plants and humans in the below article.
The initiation of pollutants into the environment, either in the form of chemical substances or energy (such as noise, heat or light), that can cause harm or discomfort to humans or other living organisms or that damage the environment is called pollution.
The different types of pollution are listed below:
Air Pollution: Air pollution is the addition of particles, gases, and chemicals into the Earth’s atmosphere that have the potential to affect human health and animal health adversely. Air may get polluted by natural causes such as volcanoes, which release ash, dust, sulphur and other gases, or by forest fires. Burning fossil fuels, mining operations, exhaust gases from industries and factories are the few sources of air pollution that are caused by humans. The impact of air pollution varied based on the pollutants released in the air.
Fig: Air Pollution
1. Noise Pollution: Noise pollution refers to an unwanted or excessive sound that affects human health, wildlife and the environment. Noise pollution is caused in two ways. Natural sources such as volcanic eruption, thunder, etc., and man-made sources of noise pollution include the use of heavy machinery, loudspeakers in public gatherings, automobiles, firecrackers, etc.
Fig: Noise Pollution
2. Water Pollution: The contamination of lakes, rivers, seas, ocean, etc., due to different sources of pollutants introduced in the water bodies that makes the water unfit for drinking, washing, growing crops, etc., is known as water pollution. The pollutants are generally introduced by human activities like improper sewage treatment and oil spills. Water pollution is mainly caused by two sources, point sources such as municipal and industrial discharge pipes and non-point sources such as agricultural runoff, acid rain, etc.
(a) Marine Pollution Marine pollution can be defined as the introduction of substances or particles to the marine environment directly or indirectly by humans resulting in negative effects such as deterioration of human health, obstruction of marine activities and lowering the quality of seawater. Petroleum, fossil fuels and oil spillage from the roads and during ship accidents, etc., enter the water or sewage system causes water/marine pollution.
(b) Thermal pollution is caused by either dumping hot water from factories and power plants or removing trees and vegetation that shade streams, permitting sunlight to raise the temperature of these waters. This has become an increasing and the most current pollution, owing to the increasing call of globalization everywhere.
Fig: Water Pollution
3. Soil Pollution: Soil pollution depicts the contamination of soil due to the presence of toxic substances such as excessive use of fertilizers and pesticides, deforestation, industrial waste, oil spillage, disposal of plastic, etc. Due to soil pollution, the quality of the soil decreases, which makes land unfit for growing crops, construction of buildings, etc.
Fig: Soil Pollution
The current generation of children, adults, animals, etc., are suffering from many diseases like blindness, skin cancer, lung cancer, cardiac diseases, etc., because of pollution caused due to the different pollutants. The increase in temperature causes global warming, acid rain, etc. We should avoid throwing dead bodies, industrial wastes, oils, etc., to the holy rivers like Ganga and Yamuna, which impact the major cause of water pollution. We can avoid environmental pollution by planting more trees, using biodegradable covers, throwing organic waste into plants that enrich soil quality, etc.
Q.1. What is pollution and its effects?
Ans: The initiation of pollutants into the environment either in the form of chemical substances or energy (such as noise, heat or light), that can cause harm or discomfort to humans or other living organisms or that damage the environment is called pollution.
Effects of pollution:
1. Pollution changes the chemical, physical, and biological characteristics of air, land and water.
2. Pollution harms human life and the life of other species.
3. It also degrades living conditions while wasting or depleting raw material resources.
Q.2. What are the 4 types of pollution?
Ans: There are various types of pollution but, the main 4 types of pollution are: Air pollution, water pollution, soil pollution and noise pollution.
Q.3. How do we stop pollution?
Ans: There are various methods to stop pollution. Few measures are given below:
1. Wastage of water should be avoided by repairing and replacement of taps/knobs.
2. Industrial waste containing various harmful chemicals should be pretreated and send to the drainage system.
3. Plastic usage can be reduced to avoid soil pollution.
4. Control of land loss and soil erosion can be attempted through restoring forest and grass cover.
Q.4. Which country has the least pollution?
Ans: Sweden has the least pollution.
Q.5. Does pollution cause global warming?
Ans: Excess release of carbon dioxide into the air due to various activities like burning of fossil fuels, deforestation, usage of automobiles, etc., leads to the cause of global warming.
We hope this detailed article on Introduction to Pollution helps you in your preparation. If you get stuck do let us know in the comments section below and we will get back to you at the earliest.
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