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.
Liquids are one state of matter.
Liquids can have many properties, including transparent or translucent, viscous or free flowing, foamy or clear. All liquids pour and flow. Liquids can take the shape of their container. The surface of liquids is level with respect to the ground. Students understand the processes of scientific investigation and design, conduct, communicate about, and evaluate such investigations.