What's the Matter? This is a science MATTER unit plan that includes lesson plans, worksheets, and experiments. It is most appropriate for 3rd- 6th grade. This MATTER BUNDLE focuses on atoms, states of matter, solids, liquids, gases, properties of matter, state changes, mixtures, solutions, density, sinking, & floating.This science MATTER lesson ideas and activity pack is the perfect addition to any 3rd- 6th grade science classroom while learning about matter. These items can be used indep