Thermometer  - a special tool we use to measure how hot or cold something is, Sun - the biggest source of heat we have, Fire - source of heat. When we light a candle, use a stove, or build a campfire, Muscule  - work and create heat. That's why we feel warm when we play or run around., Warm blooded animals - Dogs and cats can make their own heat inside their bodies to stay warm, Friction  - when things rub against each other. Have you ever rubbed your hands together really fast and felt them get warm, Temperature  - it is the measure of how hot and cold something is ,

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