In this lesson, we are going to make observations and conduct experiments to build an understanding of what makes a solid and what makes a liquid. This lesson is set up in a circuit (centers). There will be solid centers and liquid centers. Before the lesson starts there is a questionnaire to ask a couple of your students so that you can see what type of background knowledge the students have on solids and liquids. It also includes two different data sheets and a rubric for assessment. There are sample student work from this lesson.