A concept map with seven ovals, with “Composition of matter” written in the main oval at the top. Physical change is written in another oval in the second level, and the words melting and rusting in two ovals in the third level. All the other ovals a, b, and c are blank. The Composition of matter oval is connected to other blank ovals to find:

• The composition of matter does not change physically during melting and (?).
• The composition of matter does change during (?) such as (?) and rusting.