Avalanches are a mix of things that travels very fast down a hill. It also has to be slippery so that rocks, snow whatever is in its way will travel down the hill. They occur mostly in Switzerland because they have more mountains and slopes. Avalanches are dangers because they hit you at very fast speeds.
There are four basic types of avalanches.
- Loose snow avalanches occur after fresh snowfall begins tumbling down a steep mountain face.
- Slab avalanches occur when an underlying block of snow or ice dislodges and falls down the mountain.
- Powder snow avalanches contain loose snow on top a mountain and a slab of ice or snow at the bottom.
- Wet snow avalanches fall slowly down a hill, slowed by the friction created.
When an avalanche occurs it brings down all the debris with it and can case destruction in low lying areas. A powerful avalanche can even destroy buildings and power supplies can be cut off. A large number of casualties takes place after avalanches hit heavily populated areas.
People use explosives to cause an artificial avalanche.They do this prevent much larger avalanches for happening. People back burn similar to this avalanche prevention.
Avalanches are a deadly natural disaster. They can hurt people and destroy towns because they can reach very fast speeds. It is important to know about avalanches so that people can be prepared.