Environment

2. partly melted snow that is usually dirty
3. a large mass of rocks and earth that suddenly and quickly moves down the side of a mountain or hill
6. a storm with thunder and lightning and usually very heavy rain
9. a flash, or several flashes, of very bright light in the sky caused by electricity
10. a fire that is burning strongly and out of control on an area of grass or bushes in the countryside
12. a curved band of different colours that appears in the sky when the sun shines through rain
13. a large amount of water covering an area that is usually dry
14. a large amount of snow and ice that suddenly falls down a mountain

1. the loud noise that you hear after a flash of lightning, during a storm
4. a long period of time when there is little or no rain and crops die
5. a mixture of smoke, gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health.
7. something that can last a very long time / involving the use of natural products and energy in a way that does not harm the environment
8. not harmful to the environment
11. a sudden, violent shaking of the earth's surface