Natural hazards

2. a circular depression formed when the roof of a cave collapses
4. Cumulonimbus clouds, heavy rain, thunder, lightning, hail
6. Great mass of falling snow and ice.
8. A heavy snowstorm with strong winds
11. a storm with small balls of ice that fall like rain
13. a long period of dry weather
15. A rapidly whirling, funnel-shaped cloud that reaches down to touch Earth's surface.

1. a windstorm that blows hot air, dust, and grit
3. A severe storm with high winds that spiral around a calm center
5. a slide of a large mass of dirt and rock down a mountain or cliff
7. the sudden occurrence of a violent discharge of steam and volcanic material
9. a large fire that spreads quickly over a natural area
10. The shaking that results from the movement of rock beneath Earth's surface.
12. A giant wave usually caused by an earthquake beneath the ocean floor.
14. A very heavy flow of water, which is greater than the normal flow of water and goes over the stream's normal channel.