sonar

Explores the theories, tools, and technology used to investigate the mystery of the Bermuda Triangle.

The World's Most Powerful Submarines features 52 of the most significant submarines built, from the German U-9 through the USS Ray and huge Japanese I-400 class of World War II, to the great nuclear-powered submarines of the Cold War. Also included are the latest attack and ballistic missile submarines. Each entry includes a brief description of the submarine's development and history, a color profile view or cutaway, key features, and specifications. Packed with more than 200 artworks and photographs, The World's Most Powerful Submarines is a colorful guide for the military and naval history enthusiasts.

Discusses the mathematical tools and techniques that scientists use to gather, analyze and interpret data. Explains ratios, how to use them to make a scale model, and how to recognize patterns in ratio tables. Explores how scientists use sonar to map the seafloor. Teaches how to use patterns on graphs to make predictions.

Documents the efforts of crusading lawyer Joel Reynolds and marine biologist Ken Balcomb to expose a covert U.S. Navy submarine detection system that caused whales to beach themselves, an effort that challenged Ken's loyalties and pitted them against powerful military adversaries.

Presents an overview of sound waves and of the history, development, and uses of sonar by both humans and animals.