"Explores the engineering challenges behind building tunnels, as well as the creative solutions found to overcome those challenges"--Provided by publisher.
"This book discusses the science behind volcanic eruptions. The chapters examine notable volcanic eruptions in history, explain why volcanoes erupt, and show how scientists are working to understand and predict eruptions."--Publisher.
This Level 1 guided reader explores the parts and uses of four-wheel drive utility tractors. Students will develop word recognition and reading skills while learning about what happens on a farm. Index; Sources for further research; Glossary of key words.