1. Page 47 1.- Copy the sentences into your exercise book and complete the spaces. a) Raw materials can be of animal, vegetable or mineral origin. b) Raw materials are used to make manufactured goods. 2.- Copy the table into your exercise book and put the following raw materials in the correct column. Add other materials to complete the table. [materials: wool marble cotton clay cork sand silk] 3.- Which raw material do these materials come from? Glass, steel, plastic, porcelain, planks, concrete Glass: sand Steel: iron Plastic: petroleum, carbon, natural gas, cellulose, animal proteins Unit 4 - Answers to activities 1, 2, 3 Porcelain: clay Planks: wood (tree trunks) Concrete: cement, gravel, sand, water

2. Pag 47 4.- What manufactured goods can we make from the materials in exercise 2? With a partner think of three objects for each one and write them in your exercise book. Suggested answers: Glass: jug, drinking glass, plate, windscreen, shop window, etc. Steel: structure of a bridge, handrail, household appliance, chair or table legs, nut and bolt, tools Plastic: bucket, bowl, mug, bottle, wire insulation Porcelain: jug, cup, tile Wooden planks: chair, table, shelf, door Concrete: building blocks, reinforced concrete for foundations, beams 5.- Listen and repeat.. Which one is the odd one out? Why? a) Glass is not a petroleum derivative. b) Brick is not a wook derivative. c) Thread is not a stone derivative. Unit 4 - Answers to activities 4, 5

3. Page 47 6.- (Student’s own answer). 7.- Use your dictionary and classify the following textiles materials into natural or synthetic: polyester, cotton, polyamide, wool, jute, nylon, rayon, silk, linen. Natural: cotton, wool, jute, silk, linen Synthetic: polyester, polyamide, nylon, rayon 8.- Student’s own answer, example: My jacket is made of polyester. 9.- How do we use these types of stone? Granite: flooring, work sufaces, building stone, sculpture Marble: sculpture, building stone, table tops Slate: roofing, flooring, garden decorations, knife sharpeners Unit 4 - Answers to activities 6, 7, 8, 9