Students will sort picture cards of items by deciding if they are a rock or not a rock. They should cut out the headings and then place each picture under the appropriate heading. Students will sort the following items: cement block, clay pot, coal, dried mud, coral, brick, hardened lava, limestone, gravestone, asphalt, iron ore, marble statue, glass, concrete, and granite. An answer key with a brief explanation is included.
Note: This activity was inspired by a probe in Vol. 2 Uncovering Student Ideas in Science 25 More Formative Assessment Probes