Robert Gardner, a well-respected science writer now writing for the elementary-level reader introduces a set of experiment books that allow young readers to discover the answer to questions through simple activities with everyday items. Includes indications of which projects are best for science fair projects. Clear warnings call out where adult supervision is necessary. These books contain words to know, a further reading list, Internet adresses, and an index.How high are the clouds? If you dug a hole to the center of Earth, how deep would it be? Can you use shadows to find the height of a tree? There are so many things to measure in the world around you. The ideas introduced in this book will help you perform exciting and fun experiments. Some will even give you ideas for your science fair. All you need are some simple materials, most of which can be found around your home, school, or neighborhood. You will then be ready to discover the world of height and depth