Introduces the oxygen cycle and its impact on Earth. Readers will gain insight into how oxygen is created and used, what happens when it combines with other elements, and how human activities have impacted the cycle. Additional features include a diagram of the cycle, table of contents, a phonetic glossary, an index, an introduction to the author, and sources for further research.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.