Yael Calhoun 
Earth Science Fair Projects, Using the Scientific Method [PDF ebook] 

Volcanoes, mountains, and earthquakes. Fossils, glaciers, and crystals. Earth science has so many fun topics to explore, and this book is the best place to start understanding geology. Young scientists will learn about the Earth’s layers, understand the forces that change our planet’s surface, and explore how rocks, minerals, and crystals form. For students interested in competing in science fairs, this book contains great suggestions and ideas for further experiments.