Disasters & Environmental Problems

2. a large sea and freshwater fish that lives in northern regions. It is used for food and the eggs (called caviar) are also eaten.
5. the history, traditions, buildings and objects that a country or society has had for many years and that are considered an important part of its character
6. pieces of wood, metal, building materials, etc. that are left after something has been destroyed
7. to illegally catch or kill fish/animals/birds
9. to produce young animals
10. (of land or soil) that plants grow well in
12. evidence, a thing that shows that something is true
13. a mass of earth, rock, etc. that falls down the slope of a mountain or a cliff
14. a natural spring that sometimes sends hot water or steam up into the air
17. an area of land that is almost surrounded by water but is joined to a larger piece of land
19. an area of low land between hills or mountains, often with a river flowing through it
20. to fall down or fall in suddenly, often after breaking apart

1. the process of taking so many fish from the sea, a river, etc. that the number of fish in it becomes very low
3. to remove all signs of something, either by destroying or covering it completely
4. the process of changing into a worse condition
8. the outer layer of rock that forms the surface of the earth or another planet
11. coming from a particular place and having lived there for a long time before other people came there
12. an area of land when you are mentioning its natural features, for example, if it is rough, flat, etc.
15. to not give enough attention to something
16. the height above sea level
18. small stones, often used to make the surface of paths and roads