?[An] irresistible account of a child?s imaginary 8,000-mile journey through the earth to discover what?s inside. Facts about the composition of the earth are conveyed painlessly and memorably.? ?SLJ. ?An exciting adventure. . . . Illustrations [by Caldecott Medal winner Marc Simont] explode with color and action.? ?CS. <P> <awards> Best Books of 1979 (SLJ)<br>Children's Choices for 1980 (IRA/CBC)<br>A Reading Rainbow Selection</awards>