If it funds are limited, a book more broadly about volcanoes in general and/or a book more generally about Hawaii seem like more sensible options. But if you’ve got a class studying a unit on either volcanoes or Hawaii, and would like a selection that offers more specific information about these particular volcanoes, this is a good choice. It includes a bit of information about the history of the park, the role of volcanoes in creating the Hawaiian islands, general information about volcanoes, as well as specific details about the history and behavior of these particular ones. And it does it all with a format and simplicity of text that makes it suitable for young audiences.