Here is a truly informative book presented in flaps—over 75 of them! There are eight double-page spreads introducing curious young students to what can be found underground. Each page appears at first glance to be an ordinary full-page drawing of a pictorial scene. Upon closer examination the flaps will be noticed, each with a clear fingernail indentation to make lifting easier. Information is divided into the following sections: The Big Picture, Beneath Your Street, Under the City, Grubs and Shrubs, Animal Underworld, Creepy Caves, Magna Rising, and Digging up the Past. The first spread with an attempt to show the geographic picture also contains the table of contents and is, sadly, the weakest presentation. The next two sections, discussing what goes on under city streets, fills two spreads. The first handles electricity, telephone, and broadband cables, as well as water and sewer pipes, while the second deals with tall building substructures, railroad and subway transportation, and underground shopping malls. The big city is the only chapter with a vertical layout, which allows the illustrations to cover the tallest buildings and the deepest underground construction. The contents of the remaining spreads are easily identified by their titles. Publisher Usborne does its usual excellent job of comprehensive pictorial education.