The student observed convection as the ice cube melted due to the circulation of hot air around it.
Convection is the process the student observed when the ice cube melted on the park bench. In convection, heat transfer occurs by circulation of a fluid, in this case, the air around the ice cube.
During convection, the hot air near the ice cube rises, carrying the heat away and allowing the ice cube to melt. This movement of air due to temperature differences is what facilitated the melting of the ice cube.
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