人教版高二英语选修六第四单元课文预习PPT课件.ppt

A kinds of catastrophes Earthquake * Tsunami 海啸） Hurricane Flood Mud-rock flow Typhoon（台风） Volcano(火山） Hailstone（冰雹） Fire（火） What causes them? Unit 4 warming up and reading Global warming energy sources We depend on energy to do many things in our daily lives. For example, energy lights our cities and heats our buildings. Make a list of things that use energy in your home, in your school, or any other places you can think of. stove light things that use energy in your home micro-wave oven cassette player(卡式录音机） heating television hairdryer video player fridge computer washing machine stove Wind energy is used as power to produce electricity . Windmills where electricity is produced by burning coals. The coal power stations in which oil is refined and made pure. The Oil Refineries a facility designed to convert nuclear energy into electricity. A nuclear power plant on the roof of a house on a bright sunny day are used to collect solar energy, making your house warm or heating your water. Solar panels are used to keep back water and raise its level for irrigation or for producing electricity, etc. The Hydro-electric dams An energy source is “renewable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable? Discuss Sources of energy Renewable/non-renewable coal oil natural gas wind (wind power) sun (solar energy) non-renewable non-renewable non-renewable renewable renewable What are these buildings made of and what is their purpose? They are made of glass and plants can grow in it when it is cold outside. How does it work? The glass traps the heat from the sun, making the air warm so that plants can grow better. Greenhouse gases! What’s greenhouse gases effect? Greenhouse gases perform the same function as the glass in a greenhouse They trap the heat of the sun and keep the air surrounding the earth warm. It is called the gre