NATURAL FORCES

3. It happen when lava and gas are discharged from a volcanic vent.
5. an extremely large wave caused by a violent movement of the earth under the sea
6. a strong, dangerous wind that forms itself into an upside-down spinning cone and is able to destroy buildings as it moves across the ground
8. an increase in the temperature of the air around the world because of pollution
11. a large amount of snow that falls down the side of a mountain
12. the process by which the surface of something is gradually destroyed through the action of wind, rain, etc
13. something that causes a lot of harm or damage

1. a sudden movement of the Earth's surface, often causing severe damage
2. a fire burning in an area of land with many trees, that is difficult to control and sometimes spreads quickly.
4. a violent storm with very strong winds
7. a long period when there is no rain and people do not have enough water
9. a mass of rock and earth moving suddenly and quickly down a steep slope
10. a large amount of water covering an area that is usually dry