Bài giảng Tiếng anh Lớp 8 - Unit 7, Lesson 6: Skills 2 - Lương Thị Minh Hương

welcome to our classwelcome to our classTan Hung secondary school Luong Thi Minh HuongTeacher’s name:UNIT 7. POLLUTIONLesson 5: SKILL 21. Describe what you see in the pictures and talk about the relationship between them. They are both related to thermal pollutionThe first picture shows an algal bloom in coastal seawater. The second picture shows the cooling towers from a power station. Reporter: Does thermal pollution mean that bodies of water get hotter, Mr Nam? Mr Nam: Not always. Sometimes the water becomes colder, and that’s also thermal pollution. In general, thermal pollution means a change in the water temperature. Reporter: That’s interesting! What causes it? Mr Nam: Power stations are one factor. They use water in the nearby lakes or rivers to cool their equipment, which heats up the water. Then they dump the hot water back into its source. Reporter: Are there any other causes? Mr Nam: Yes. Thermal pollution may also happen due to the discharge of cold water from reservoirs into warm rivers. Reporter: Thermal pollution can have dramatic effects. Right? Mr Nam: Certainly. Most aquatic creatures need a certain temperature to survive. Warmer water has less oxygen in it, and this can harm fish populations. Besides, warmer water can cause harmful algal blooms. This can change the colour of the water like in the first picture and, more seriously, the algae poisons the fi sh. Reporter: What can we do, Mr Nam? Mr Nam: In many places, they build cooling towers like in the second picture to cool down the water from power stations. Reporter: Anything else we can do? 2. Listen to part of a conversation on TV between a reporter and an environmentalist about thermal pollution. Complete the diagram. Use no more than three words for each blank.2. CAUSES Power plants using water to (3) equipment - Discharge of cold water into (4) .1. Thermal pollution: - Definition: Water getting (1) or (2) .3. EFFECTS - (5) decreasing oxygen - Less oxygen harming (6) . - (7) .. algal blooms being another effect - Can change (8) of the water and (9) .. fish4. SOLUTIONS - Building cooling towers to (10) . the waterhottercoolercoolwarm rivers Warmer water fish populations Harmful colourpoisoncool downWRITING3. Work in pairs. Discuss the causes and effects of one type of pollution in your area. Make notes in the diagram. . pollutionDefinition: EFFECTS CAUSES Air PollutionAir pollution /be / one / serious /type / pollution. Air pollution occurs ........... which /be / harmful / man, vegetation, and animals .Air pollution can / different causes. The major source / air pollution /be/ . The second /be / ......................Air pollution can / dramatic effects. It causes So, what should we do to reduce air pollution?Definition:Causes:Effects:Exercise 3,4,5p12 Air pollution occurs when the air contains gases, dust, fumes in harmful amounts.-industrial waste exhaust from cars and planecausing diseases, death to human, damage to other living organisms such as animals and food crops, or the natural environment.Air PollutionAir pollution /be / one / serious /type / pollution. Air pollution occurs ........... which /be / harmful / man, vegetation, and animals .Air PollutionAir pollution is one of a serious type of pollution. Air pollution occurs when the air contains gases, dust, fumes in harmful amounts which are harmful to man, vegetation, and animals .Air pollution can / different causes. The major source / air pollution /be/ . The second /be / ......................Air pollution can have many different causes. The major source of air pollution is industrial waste from factories. The second is the exhaust from cars, motor vehicles and planes... Air pollution can / dramatic effects. It causes Air pollution can have dramatic effects. It causes various dangerous diseases, death to human, damage to other living organisms such as animals and food crops, or the natural environment and the buildings look dirty. Air PollutionAir pollution is one of a serious type of pollution. Air pollution occurs when the air contains gases, dust, fumes in harmful amounts which are harmful to man, vegetation, and animals .Air pollution can have many different causes. The major source of air pollution is industrial waste from factories. The second is the exhaust from cars, motor vehicles and planes... Air pollution can have dramatic effects. It causes various dangerous diseases, death to human, damage to other living organisms such as animals and food crops, or the natural environment and the buildings look dirty. So, what should we do to reduce air pollution? Revise the new words Prepare the new lesson : Looking BackThank you for your attendance !See you again !