Dr. Robert C. Mebane & Thomas R. Rybolt 
Environmental Science Fair Projects, Using the Scientific Method [PDF ebook] 

What is the best way to clean oil off feathers? How does soil erosion affect plant growth and food supply? Can the force in wind be used to generate electricity? The answers can be found by doing the fun and simple experiments in this book. Young scientists will explore the environment, the air, water, soil, pollution, and energy resources. For students interested in competing in science fairs, this book contains great suggestions and ideas for further experiments.