A delightful way for children to master new subjects and for adults to brush up on old ones! The front of the placemat is brightly colored, and laminated with a non-glare laminate. It features the the different types of rock, examples of each rock, and where they can be found in the Earth's crust. The black & white back features a chance for children to label what type of rock each example is using a wipe-off marker. Laminated surface wipes clean with a damp cloth. 17-1/2 x 12".