Presentation on theme: "3 Air pollution p.268. Objectives Students should learn: that air can be polluted with smoke and gases, such as sulfur dioxide, which contributes to acid."— Presentation transcript:
Objectives Students should learn: that air can be polluted with smoke and gases, such as sulfur dioxide, which contributes to acid rain that acid rain may damage trees that plants and animals cannot survive if the water in rivers and lakes becomes too acidic that tiny solid particles polluting the air can cause global dimming
Outcomes Most students should be able to: describe how acid rain is formed describe some of the effects of acid rain on living organisms explain how air pollution can result in global dimming. Some students should also be able to: analyse and interpret scientific data concerning the effects of acid rain.
Specification Waste may pollute: – … air, with smoke and gases such as sulfur dioxide, which contributes to acid rain. Analyse and interpret scientific data concerning environmental issues.
Biology B3 4.3Air pollution Answers to in-text questions a Oil, coal, natural gas. b Sulfur dioxide and nitrogen oxides. c The acid kills the leaves, so the trees cannot make food. If it soaks into the soil, it can kill the roots. Summary answers 1 fossil, carbon dioxide, sulfur, nitrogen oxides, sulfuric, nitric, acid rain 2 a i Sulfur dioxide, carbon dioxide and nitrogen oxides are produced from impurities when fossil fuels are burned. These cause air pollution. ii Sulfur dioxide and nitrogen oxides in the air dissolve in the rain and fall to the ground. The water runs into streams, rivers, etc. and lowers the pH, making them more acidic. iii Acid rain falls on the ground, soaks in and causes it to be acidic. b The sulfur dioxide and nitrogen oxides produced by burning fossil fuels are carried high in the air by the prevailing winds. They can be blown hundreds of miles before they dissolve in rain and are carried to the ground. So every country needs to control emissions from the burning of fossil fuels to prevent any country being affected by acid rain. 3 a Global dimming is the reduction in light reaching the surface of the Earth because light is refl ected away by the build up of pollution particles in the air (from sulphur compounds and smoke particles). b 14 x 100 = 78% 18 c Europe has controlled air pollution as seen by reduction in sulfur emissions; smoke will be controlled at the same time; this reduces the number of particles in the air reflecting the light and so reverses dimming effect of air pollution.
Useful slides you may use; Look in the air quality files (presentation near end is good)
Air pollution Human activity produces two main types of air pollutant: particulates – These are tiny particles suspended in air (e.g. smoke), which are usually produced by the combustion of fossil fuels. noxious gases – These include carbon dioxide (CO 2 ), sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ). Air pollution has been a major problem since the Industrial Revolution of the late 18 th Century, and has been made worse by humans’ reliance on burning fossil fuels for energy. Air pollution, global warming, acid rain, damage to the ozone layer and smog. Each of these has serious implications for the environment and human health.
Acid rain Sulfur dioxide is released when fossil fuels like coal and oil are burned. It dissolves in rain water to make sulphuric acid Acid rain (pH less than 5.5) damages rivers and lakes, making them more acid, so killing fish. Acid rain damages trees. Acid rain damages limestone buildings. Nitrogen oxides released in car and jet fumes also cause acid rain. Digital Vision (NT)