Making Your Own Dinosaur Fossils - Fun at Home with Kids
30 Playful Ways to Teach Young Kids About Rocks (Fantastic Fun Learning)
Panning for Gold - collect & paint rocks & hide them in sand. use sifters to 'pan for gold' - from Mess for Less (",) sensory table
Volcano craft for preschoolers. Maybe have the letter V on the Volcano?
Love this Museum of Turnupstuffing, showcasing the found art treasures kids collect when they playoutdoors