"The World Under Your Feet" presents a peculiar journey across the earth from a peculiar perspective. From the ground under your feet, through the crust, mantle, outer core, to the inner core of the earth, and from the inner core to the other side of the earth. Give your child a whole new perspective on the earth. The whole book can be expanded into a 2.5-meter-long organ page, with unique pictures, rich knowledge points, exquisite illustrations, and careful printing, which are indispensable treasures.