Thermal energy flows from hot matter to cold matter. So, in the context of Anna's observation, thermal energy is moving from the hot chocolate (which is hot) to the surrounding colder air in the skating rink.
Anna looks around the skating rink and notices many examples of the movement of thermal energy. For example, she sees her friend holding a cup of hot chocolate in the cold rink. Thermal energy flows from
matter to
1. hot
2. cold
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