English Unlimited HTL 2, Schulbuch mit Audio-CD und CD-ROM

77 The story of stuff 06 LANGUAGE SKILLS EXPLORE LOOK AGAIN EXTRAS Circle the correct option to complete the definition. Match the types of plastic production with the correct pictures and definitions. Use a dictionary to help you. Can you think of three products for each type of plastic production? What’s your opinion on the different kinds of material? Talk together. The students and teachers of a school have been asked to decide what type of chairs are going to be bought for the new building. Listen to the debate. Who supports which material? Listen again and write down two good and two bad points mentioned about each material. Complete the ‘metal facts’ with the words from the box. A B C 31 1 hollowed-out shape that is filled with liquid plastic, then set: 2 soft plastic pushed or drawn through a die of a cross-section profile: 3 plastic melted and drawn / spun into fibres: 32 a TCD 2/03 b c b Plastic is a man-made material consisting of very large / small molecules. Plastic is heavy / light, has a high / low corrosion resistance, high / low strength-to-weight ratio and a high / low melting point. 29 30 a drawing extruding moulding tungsten alloy iron (2x) copper aluminium Plastic Metal Metal facts Metals are chemical elements that are used in a number of ways. ey are usually solid, good conductors of electricity and heat, and shiny when clean. Metals are strong but also malleable, which means they can be bent and shaped. e most common metal found on Earth is (1) , mostly because it makes up such a large part of the Earth’s core. e chemical symbol is Fe . Steel, used in buildings, tools and cars, is a well-known (2) and made from (3) and a small amount of carbon. (4) (Al) is the most common metal found in the Earth’s crust. It is a good conductor of heat and is oen used to make cooking pots. (5) (Cu) is a good conductor of electricity and is oen used for making wires. It’s relatively so. (6) , also known as wolfram, is a chemical element with the chemical symbol W . It has a very high melting point. Nur zu Prüfzwecken – Eigentum des Verlags öbv