"Rain, rain, go away" is a phrase we often hear, but readers may change their minds when they learn the science behind one of nature's most frequent phenomena. Readers learn why we need rain and what has to happen for Earth to stay hydrated. Age-appropriate content explains every step of the water cycle, while a detailed infographic helps readers visualize the process. Full-color photographs accompany the text, turning rainy days into something wondrous and exciting.