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What happens to the environment when a drought occurs? What are some of the causes of droughts? What can people do about the problems caused by droughts? How can you use your math skills to learn more about droughts? Read this book to find the answers to these questions and learn more about droughts.|Index|Sources for further research|Glossary of key words|Informative sidebars|Table of contents|Author/Illustrator biography|The Real World Math series shows readers how they can use math skills to learn more about the 21st century world that we live in.