Unit 2A

5. A person who fells trees for timber
6. Increasing or reviving after a period of little activity, popularity, or occurrence
11. The ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells
12. A quantity of liquid that has spilled or been spilt
14. The action or fact of moving along in a steady, continuous stream
15. An unexpected or casual meeting with someone or something
16. A colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air
18. A person who acts in contradiction to his or her stated beliefs or feelings
19. Disturbance or problems which interrupt an event, activity, or process

1. The action or state of making or being made impure by polluting or poisoning
2. The action of clearing a wide area of trees
3. A river or stream flowing into a larger river or lake
4. A social division in a traditional society consisting of families or communities linked by social, economic, religious, or blood ties, with a common culture and dialect, typically having a recognized leader
7. Bitterness or ill feeling
8. The action of using up a resource
9. A condition of having to work very hard without proper remuneration or appreciation
10. A loud and confused noise
13. Occurring naturally in a particular place
14. An overflow of a large amount of water beyond its normal limits, especially over what is normally dry land
17. In a very serious, gloomy, or depressing manner