16 labs for kids to be geologists as they investigate rocks, minerals, and crystals. ✜ grow crystals and study their angles. ✜ make models of sedimentary, metamorphic, and igneous rock types. ✜ travel through the rock cycle, and record your journey using a string of beads. ✜ mix sand, clay, and pebbles with water and salts to make a sedimentary rock.✜ study different samples of sand and clay to see the variety in grain size, shape, and luster. ✜ model rock metamorphosis to see why most fossils d