The document describes a process for students to learn about acid rain and its effects on trees. Students are asked to: 1) Read a text called "Trees in Danger" that describes how pollution is killing trees through acid rain. 2) Make a poster about pollution in their neighborhood and present it to the class. 3) Draw a tree showing parts mentioned in the text, and label different types of trees, animals, air pollutants, and substances involved in acid rain formation. 4) Describe the process of acid rain formation using passive voice.

1. DESCRIBING A PROCESS Teacher: Sandra Milena Ortiz

2. You need the passive voice to describe a process in all the activities you make dialy. Moreover, English speakers use passive voice continuosly. It is important to take into account all the steps you need in order to have a product INTRODUCTION

3. TASK Read the text «Trees in danger» and make the next exercises: Present a written work about the reading. Make a poster about how the pollution is affecting your neighborhood and present it in front of the class. http://www.youtube.com/watch?v=yKUNYp_Bc0g

4. TREES IN DANGER Millions of year before animals lived on land; there were trees on the Earth. But today trees are in serious danger. In the 1970´s many of the el trees in Europe were killed by Dutch elm disease. Now an even greater danger is threatening the forest and woods of Europe from northern Sweden to southern Italy. This new danger attacks all trees: deciduous trees like oak, beech and birch as well as coniferous trees like fir and pine. First, the branches turn yellow and brown. Then, the trees ´needles or leaves fall. The roots and the trunk shrink, finally the trees die. But, what is killing the trees? Nobody knows exactly, but it is probably air pollution or acid rain. Factories, power stations and cars emit tons of smoke into the air. This smoke contains sulphure dioxide and nitrogen oxide. These substances mix water vapor in the atmosphere and form sulphure acid and nitric acid. Sunlight turns these acids into poisonous oxidants which fall in rain or snow onto the trees. Trees are important because they provide a home for other plants, and animals too. They produce protect the flowers which grow on the forest floor. They provide food for insects, reptiles, birds and mammals. They protect the soil from the wind and the rain. Most important of all, the forest are the lungs of the planet. Trees produce the oxygen which we breathe. If the trees die, we will too. (Produced by Trees in Danger, 45 Jacob Street, Birmingham 9) .

5. Read the text: “The acid rain” Draw a big tree and sign the parts you found in the text. Find: two dangers to tree, six kinds of trees, six kind of animals, three things which produces air pollution, four substances which form acid rain, three reasons why trees are important. Describe the process of the acid rain using the passive voice and draw it. PROCEDURE

6. RESOURCES You can find some information obout passive voice on this web: http :// www.ego4u.com/en/cram-up/grammar/passivea Search the material that you will need in order to make a good oral presentation

7. Evaluation `The criteria that the teacher is going to take into account are: Use of grammar: 40% Speaking skills: 40% Creativity: 20%

8. CONCLUSIONS This task helped you to: Practice the passive voice using the verbs in different tenses. Knowing the process of the acid rain. Talk in English about the pollution.

9. CREDITS Webquest created by: Sandra Milena Ortiz Universidad Libre de Colombia Especialización en gerencia educativa Tecnologìa I Enero 29 2012 «Trees in danger», 45 Jacob street Birminghan 9. http://iteslj.org/cw/