Children who use the ground solely as a hard surface on which to walk are thoroughly enlightened on the existing wonders just beneath their feet. There are ""fish inside rocks..., bones in stones..., rivers we cannot see..., buried cities..., tunnels for trains..., stones for buildings..., wires and pipes"". Each of these and other headings too are explained verbally in a short paragraph and visually in a double spread illustration in two colors. Scattered facts pertaining to archaeology, mining, building, though simply presented, call for a slightly older audience than the little male digger pictured here. We recommend this for first and second graders who have acquired facility with the printed word.