In this activity, students learn about matter and the physical properties of mass and volume. Students will work in groups to organize activity cards (included) into various categories. Students will learn by organizing these items that all objects are made up of matter, mass, and volume. The lesson is presented in a Powerpoint. The Powerpoint is divided into two sections. The first section if for teacher instruction, and the section is for presentation to the class. The lesson includes standards for 2nd, 3rd, 4th, and 5th grade.