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This is a lesson about gathering information, applying scientific identification processes, and identifying unknown rocks. Learners will conduct an investigation, observe and record the physical characteristics of an unknown rock (meteorite), determine the mass of the unknown rock using math skills, determine the density of the rock, describe and classify a meteorite, apply observations and knowledge to the process of a scientific investigation, present evidence to verify classification decisions, and explore concepts of spatial relationships. Completion of all parts of the lesson is necessary to identify the unknown. Advanced preparation and procedural tips are included. This is lesson 13 of 19 in Exploring Meteorite Mysteries.