Read the passage and answer the questions ( 5 pts)

A burn is an injury to the skin caused by exposure to fire, hot liquids or metals, chemicals, electricity or the sun‘s ultraviolet rays. When someone gets a burn , it‘s necessary to provide first - aid right away. First aid for burns involves removing the source of the burn as soon as possible. The burns should be cooled immediately with cold water. A clean, cold wet towel or dressing can be placed on less serious burns to ease pain and protect the burns from contaminating. If the burn is caused by chemicals, it should be bathed continuously with running water for at least 20 minutes to reduce the substance. Any powder should be carefully brushed off with gloved or protected hands before washing. Wet dressings should never be used for burns. Instead, the first - aid provider should gently apply dry, sterile dressing held in place by bandages and seek immediate medical attention.

* Question:

1. What can cause burns?
2. When should the source of the burn be removed?
3. Why should we place clean, cold wet towels on less serious burns?
4. How long should the burn caused by chemicals be washed with water?
5. What kind of dressings should the first - aid provider use?