The Oxygen Cycle
The Oxygen Cycle. (n.d.). Ducksters. https://www.ducksters.com/science/ecosystems/oxygen_cycle.php
Oxygen is an important element to life on Earth. It is the most common element of the human body. It makes up about 65% of the mass of the human body. Most of this is in the form of water (H2O). Oxygen also makes up about 30% of the Earth and 20% of the atmosphere. Oxygen is constantly being used and created by different processes on planet Earth. All of these processes together make up the oxygen cycle. Here you will learn about the oxygen cycle and the different processes that use oxygen. To continue reading, follow the link above.