States of Matter activities, worksheets, definition cards and posters. The unit deals with the three States of Matter: solid, liquid, and gas. Definition posters are also included for light terms such as âłsolid, âliquid, âď¸gas, âžmatter, âď¸freezing, âmelting, particles, â¨ď¸evaporation, condensation, and collection. It also contains a sorting activity for sorting different pictures of objects as either solids, liquids, or gases. âWorksheets are included with âanswer keys.See the digital version her