When going through topics on melting and freezing, i came across 2 graphs of slightly different curvature for both the heating and cooling of naphthalene. The ending part of the graphs are the ones that confuse me, whether slope upwards or downwards. Most graphs in the internet just show straight lines or some curve one way, some the other way. (Pls refer to attached) Heating curve: A or B? Cooling curve: C or D? Also, would the graph be similar to another substance, say stearic acid? Thanks much!