UNIT 4

2. an arch (= curved shape) of different colours seen in the sky when rain is falling and the sun is shining:
4. worried and nervous:
5. the season of heavy rain during the summer in hot Asian countries:
8. made by people, often as a copy of something natural:
11. covered in water or another liquid:
12. sending out or reflecting light:
14. a long period when there is little or no rain:
16. rainstorm:
17. any of various units of measurement, especially of temperature or angles, usually shown by the symbol ° written after a number:
19. a tube inside which liquid or gas flows from one place to another:

1. a large amount of ice, snow, and rock falling quickly down the side of a mountain:
3. a severe snow storm with strong winds:
6. a short period of rain:
7. a large amount of water covering an area that is usually dry:
9. with clouds:
10. an extreme weather condition with very strong wind, heavy rain, and often thunder and lightning:
13. to feel pain in a part of your body, or to injure someone or cause them pain:
15. a very strong wind:
18. the direction from which the sun rises in the morning, opposite to the west, or the part of an area or country that is in this direction:
20. to say that an event or action will happen in the future, especially as a result of knowledge or experience: