Natural Disaster

3. a large mass of snow,ice and rocks that falls downthe side of a mountain
5. a mass of rock and earth moving suddenly and quickly down a steep slope
8. a sudden movement of the earth's surface that often follows an earthquake and is less violent than the first main movement
10. an occasion when a volcano explodes, and flames and rocks come out of it; (of a volcano) the act of doing this
12. ...slope
13. strong, unpleasant, and sometimes dangerous gas or smoke
16. the set of necessary tools, clothing, etc. for a particular purpose
17. If a ship or a boat is ..., it cannot be sunk
18. to cover or reach a wider or increasing area, or to make something do this
19. a long period when there is little or no rain

1. to fall down suddenly because of pressure or having no strength or support:
2. a line that has been agreed to divide one country from another
4. to move people from a dangerous place to somewhere safe
6. broken or torn pieces left from the destruction of something larger
7. a powerful effect that something, especially something new, has on a situation or person
9. a person injured or killed in a serious accident or war
11. a slight shaking movement in a person's body, especially because of nervousness or excitement
14. important or noticeable
15. ...lava