Books by Sally M. Walker

Soil can be found almost everywhere on Earth. Sand is a soft soil that is found in deserts. Loam is soil that is great for growing plants. But how are these types of soils different? And how are they made? Explore the amazing world of soil in this book.

In 1938, off the coast of South Africa, a woman found a strange blue fish with four stubby fins, pointed spines, and a funny looking tail-it was a coelacanth! Until that very moment, the world had believed that coelacanths were extinct. Suddenly, scientists around the world were excited-could more of these unusual creatures be found and studied? Discover how scientists worked to solve the mystery of these extraordinary fish.