Explains what gemstones are, the scale to rank hardness called the Mohs' scale, how stones are weighed, how they are formed, how stones are cut, and non-jewelry uses for gemstones.
Presents information on extreme scientists, including where they work, what they study, and how they conduct their research. Includes statistics, a glossary, and a list of additional resources.
"This book explains how seafood is raised, harvested, and processed. It also explores the pros and cons of fish farming and fishing in the wild"--Provided by the publisher.
Describes what causes different kinds of volcanoes to form and how eruptions work and discusses some of histories most devastating eruptions and how much damage they caused, as well as the methods experts use to predict and protect against eruptions.
