A Secret, Invisible Cycle
We breathe in oxygen and breath out carbon dioxide. Plants take in carbon dioxide and give out oxygen.  This recycling of carbon and oxygen gases happen again and again. It is known as the oxygen cycle. Move your cursor over the picture to see this important cycle at work!
Green plants have little openings in their leaves called stomata. They take in the carbon dioxide through their stomata. The plants use light energy from the sun to change carbon dioxide and water into oxygen and sugar. They use the sugar as food and release the oxygen into the air again. This process is called photosynthesis.
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