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Product Description Why does it rain? This title introduces readers to the water cycle. Evaporation, precipitation, condensation, and other vocabulary words are defined. Each stage of the water cycle and why it is important to humans is explained. Graphics provide additional support. An activity to help readers understand the concept is included. About the Author Rebecca Olien was an elementary school teacher for 20 years. She has since written over 50 books for children and educators. Currently, she is an instructional designer and curriculum developer.