What is soil made from? How do earthworms help keep soil healthy? Why can soil help us study the history of a place? Find out answers to these questions and many more in this fun introduction to soil. Find out what soil is, how it is made and what we use it for. With the help of Rock Solid! facts and cool examples, you'll discover how amazing soil can be, from making houses with mud bricks to helping crops grow in volcanic soil.
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