An artist is using wooden cubes to build a statue. Yesterday, she placed one wooden cube on the statue, and today she is going to put an identical wooden cube on top of it. Both cubes are the same size and have the same number of molecules. The diagram above shows the cubes now, before they are touching. Use the information in the diagram to answer the question. How does the temperature of the top cube compare with the temperature of the bottom cube now, and what will happen when the cubes have been touching for a while?