The Oxygen Cycle

The movement of oxygen from product of photosynthesis, through the human system, water, and Earth's atmosphere is a scientific model called the oxygen cycle. And it's essential for life on Earth to continue. Through accessible language and full-color diagrams and photographs, this book explains an important natural cycle to readers of all levels, particularly those struggling to understand a standard text book. Fact boxes and an extended glossary allow for the inclusion of the most importan...