It is April 22 and your class it outside cleaning the park. But do you knowwhy? Its <strong>Earth Day</strong> Turn the pages of this book to find out what caus... » 

It is April 22 and your class it outside cleaning the park. But do you knowwhy? Its Earth Day Turn the pages of this book to find out what causes airpollution how a river caught fire in 1969 and what you can do to help Eartheveryday. «