The process by which plants release oxygen into the atmosphere is called photosynthesis. During photosynthesis, plants utilize sunlight, carbon dioxide, and water to produce glucose and oxygen. The process occurs primarily in the chloroplasts of plant cells, where chlorophyll captures sunlight. The equation for photosynthesis can be summarized as 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. This not only provides essential energy for plants but also plays a vital role in maintaining atmospheric oxygen levels, supporting life on Earth by supplying oxygen for animals and humans to breathe.