The Hoover Dam is one of the largest dams in the world! It provides power and water to people in Arizona, Nevada, Utah, and California. Just how does the Hoover Dam work? And how many people did it ta
Introduces the Rocky Mountains, describing how they were formed, the plants and animals found there, and information about visiting the Rocky Mountains.
Landslides can bury homes and bulldoze trees. Students learn about the conditions that can lead to these natural disasters, including flooding and land erosion.
How many kinds of warships are made? Who lives and works on warships? Covering everything from prow to stern, this book reveals how these powerful ships help protect our country and our people.
Provides an overview of the tank--the armored vehicle--including the different parts of the tank, what each crew member does, and the kinds of things tanks can do.
