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List and describe the sources of heat.

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1. Sun: It is the primary source of light and it gives us light and heat. 

2. Combustion: Heat energy can be generated by the burning of fuels like wood, Kerosene, Coal, Charcoal, Petrol etc.

3. Friction: We can generate heat by rubbing two surfaces of some substances. In the past people used to rub two stones together to light fire. 

4. Electricity: When Electric current flows through a conductor, heat energy is produced. Ex.: Iron box, Electric kettle.

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