CLASS: 8th CHAPTER No. 5: POLLUTION AND THE ENVIRONMENT Question No. 1: what are the main causes of the air pollution? Answer: The main causes of air pollution are the combustion of fossil fuels and wood. The pollutants produced by combustion include nitrogen oxide, Sulphur dioxide, carbon monoxide and hydrocarbon gases, together with large quantities of particulates-tiny particles of solid material such as soot and dust. Question No. 2: Why is it dangerous to run a car engine in a closed garage? Answer: it is dangerous to own car engine in a closed garage because when the supply of an air is limited, car exhausted fumes contain a large quantity of poisons carbon monoxide. Question No. 3: What are particulates and why are they harmful? Answer: Particulates are tiny particles of solid material such as soot and dust. Inside our bodies they get into our lungs and other parts of the respiratory system and produce the disease such as: a. Asthma b. Bronchitis c. Pneumonia Question No. 4: What is difference between the greenhouses effect and global warming? Answer: The greenhouses effect is a natural process that keep the earth temperature at comfortable level. Global warming is the global change in the world climate caused by the increased greenhouse effect as a result of air pollution caused by human activities. Question No. 5: What is greenhouse effect? Answer: The greenhouse effect is a natural process that keeps the temperature on the earth comfortable. Certain gases in the upper atmosphere make it harder for the near energy to escape into the space. Detail Question No. 1: In your own word describe how acid rain is produced and how it damages ecosystem? Answer: Acid rain is produced when gases such a Sulphur dioxide and oxides of nitrogen in vehicle exhaust fumes and smoke dissolves in droplets of moisture in air. Although acid rain looks and feels quite harmless. It can kill tree fish and other water animals. It can also eat into stonework and metal and wash certain important mineral salts out of soil reducing the amount of these minerals available to plant Question No. 2: List three types of air pollution that can occur indoor? Answer: Some of the types of air pollution which occur indoor include fumes from cooking and heating on open fires on traditional stove, tobacco smoke and the fumes and vapours given off by paints varrisles glues, polishes and cleaning materials and insecticides used indoor.