Classification systems are used by scientists to help us understand the natural world. When objects or living things are classified, they are simply sorted into a group with other similar objects or living things. Rocks can be classified by their size, shape, texture, color, luster, layers, and crystal size. Luster refers to how light is reflected from the surface of a mineral. Words like shiny, metallic, and dull describe luster. 1. Click the to watch a video about classifying rocks. 2. Click to open the template. 3. Observe 👀 the rocks. Think of a way to classify the rocks. 4. Use the tool to classify the rocks into groups. 5. Use the tool to label each group. 6. Use the to explain how you formed your groups. Use the when recording to point to each group. 7. Click the green to save.