Gateway B1 Unit 6

3. to change waste materials such as newspapers and bottles so that they can be used again
4. a large area of ice that covers the land and sea around the North or South Pole
5. to change a solid substance into a liquid
8. a piece of land that is completely surrounded by water
11. radiation accidents and incidents
12. the slow increase in the temperature of the Earth caused partly by the greenhouse effect increasing the amount of carbon dioxide in the atmosphere
13. the process of damaging the air, water, or land with chemicals or other substances
14. an area of sand or small stones beside the sea or a lake

1. a low area of land between mountains or hills, usually with a river flowing through it
2. to reach a place, after having been somewhere else
5. a natural structure like a very big hill that is much higher than the usual level of land around it
6. the environmentthe natural world, including the land, water, air, plants, and animals, especially considered as something that is affected by human activity
7. a thick tropical forest
9. a large area of land covered by trees and other plants growing close together
10. a long period of time when there is little or no rain and crops die