This resource is great for a an introductory or extension assignment, as well as a sub plan assignment, no outside sources are needed. The worksheet utilizes informative text and illustrations to provide a foundation of knowledge over the following standard: SC.8.P.8.4 - Classify and compare substances on the basis of characteristic physical properties that can be demonstrated or measured; for example, density, thermal or electrical conductivity, solubility, magnetic properties, melting and boil