This is a science experiment that can be used with any energy or weather unit since it deals with rising temperatures and and causation (being the sun). I have included photo procedures to making the experiment, as well as a normal written procedure sheet. There is also a sheet for the kids to graph the change in temperature and answer questions as to why their oven changed temperature.
My kids enjoyed this so much, but be warned, the chocolate gets VERY MESSY once melted! We all took a trip to the bathroom to wash hands and faces, but it was well worth it!