Unscramble each of the clue words.
Copy the letters in the numbered cells to other cells with the same number.


1. a large area of trees growing close together
2. damage caused to water, air, etc. by bad substances
3. the gradual development of plants, animals, etc. over many years as they adapt to changes in their environment
4. to harm or break something
5. to damage something so badly that it cannot be used or does not exist
6. rain that contains harmful chemicals from factory gases and that damages trees, crops and buildings
7. the regular pattern of weather conditions of a particular place
8. all the plants and living creatures in a particular area considered in relation to their physical environment
9. a chemical element that is a gas with no smell or color
10. turbines convert it into mechanical power. A generator can convert mechanical power into electricity