Why do seasons happen? Where do animals go in winter? How do plants reproduce? From changes in the plant world through the year, to penguins preparing a nest, and puma kittens learning to hunt, plants and animals from every corner of the world are used to illustrate the many processes that govern natural life. These include metamorphosis, hibernation, migration, pollination, plus the many environments in which they occur, such as savanna, swamp, jungle, and deciduous woodland. The four acetate overlays feature: Winter to Spring: the Himalayan Mountains change Spring to Summer: a South American pampas over time Summer to Fall: deciduous woodlands turn with the season Fall to Winter: a conifer forest prepares for the cold. The Uncovering series: Exposing science and technology in stunning color and detail. Jam-packed with exacting full-color illustrations, these titles focus on topics of particular interest to young readers. Informative text and descriptive captions and sidebars complement dozens of annotated drawings. Each book contains four acetate overlays, used in some cases to show changes over time, in others to show a cutaway interior.