This unique, vertically unfolding book takes readers on an incredible journey beneath the city streets. Starting with simple soil and worms, the adventure descends through layers of pipes, animal burrows, ancient fossils, molten rock, and finally to the Earth's core. With beautiful illustrations and clever die-cut pages, it reveals the hidden, interconnected world below our feet. Readers discover how everything from subway tunnels to dinosaur bones forms part of our planet's fascinating story.