Have you ever wondered where the rain comes from? Have you ever wondered where it goes? Hydrologists think about that all the time. They study water! Hydrologists want to know all they can about water. They study how it forms into clouds. They study how water moves in rivers. They study what makes a flood. This edition focuses on the water cycle. As students learn about the water cycle and related geography, they’ll move through the scientific method and will read, question, experiment, and record their findings.