Students will use crayons to model the rock cycle by first examining a crayon, shaving bits of two different ones to form sedimentary rock, and then melting the bits together to form metamorphic rock.
This is an activity out of the book I have called Science Made Simple. Sample file contains a look at many lessons from the book so you can see the general quality of the lessons. All lessons are hands-on and use simple supplies that can be done by any teacher anywhere. The full book can be purchased in my store.