Why do things start to rot? Is mold dangerous? Questions such as these are answered as readers explore the fascinating process of forest decay through accessible text and full-color photographs that help readers understand this important natural process. Readers learn what types of organisms in forests cause trees to rot and mold to grow, along with how these processes affect the entire forest ecosystem. Fun fact boxes and an age-appropriate glossary expand on this essential elementary curriculum topic that is sure to appeal to nature lovers and budding scientists.