It is published and marketed by Delta Education. In this module, first graders will have introductory experiences with two of these states of matter, solids and liquids.
Solids are one state of matter.
Solid materials have properties that separate them from other states of matter. Materials can be sorted based on their properties. Particles of solid materials can pour like liquids but also maintain their shape. Solid materials can support denser materials on their surfaces. Solid particles can be separated with a screen.