Soil can be black, brown, red, yellow, or gray. It can be dry and crumbly or wet and sticky. There are many different types of soil, but they all have one thing in common--they are made mostly from rock Inside this book, readers will discover how soil is formed and what ingredients make up soil. How do hard rocks become soft soil? How do plants become part of the soil when they die? And is animal poop really one of the ingredients in our gardens?...