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Which of the following describes an increase in temperature?
Cooling
Heating
Chilling
Loosening
The correct answer is: Heating
Heating describes an increase in temperature because it directly refers to the application of thermal energy to an object or system, causing its temperature to rise. When heat is applied, the molecules within the material gain energy, leading to increased motion, which manifests as a higher temperature. In this context, other options do not relate to an increase in temperature. Cooling refers to the process of lowering temperature, while chilling similarly indicates a decrease in temperature. Loosening does not pertain to temperature changes at all but instead refers to a state of relaxation or reduction of tension in physical materials or objects. Thus, heating is the most accurate term to describe an increase in temperature.