If apan is used for cooking food by heating food in it on a source of many accidents in the kitchen, then apan is used for cooking food by heating food in it on what?

Answer choices:
- A source of kitchen accidents.
 - by indirect light
 - Evaporation of water
 - Earth revolving around the sun
 - Electrical energy
 - degrees Celsius
 - a hydraulic system
 - heat is produced

 

 A source of kitchen accidents.         