In this picture book, children learn the natural cycles of soil and water as well as the human-assisted one of composting. Soft, full-page watercolor illustrations lend a glow to the gentle text, which guides readers through the birth, life, death, and reuse of an oak tree as well as the travels of a drop of water. A brief recap gives some facts regarding each cycle. The process of composting, from garbage to soil to nutritious food and back again, encourages readers to think about how to reuse items rather than discard them. A valuable addition to early earth-science units.