Rusting - This is also called oxidation. The steps involved in the oxygen cycle are: Stage-1: All green plants during the process of photosynthesis, release oxygen back into the atmosphere as a by-product. Plants - Plants create the majority of the oxygen we breathe through a process called photosynthesis. They breathe in oxygen and breathe out carbon dioxide. When things burn, they use up oxygen and replace it with carbon dioxide. The oxygen cycle is thus a biogeochemical cycle that describes the movement of oxygen within the earth’s three main reservoirs – the lithosphere (land), the hydrosphere (water), and the atmosphere (air), which make up the earth’s biosphere. The oxygen cycle is interconnected with the carbon cycle. Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Stage-2: All aerobic organisms use free oxygen for respiration. Combustion - There are three things needed for fire: oxygen, fuel, and heat. Breathing - The scientific name for breathing is respiration. The Humans Use Up The Oxygen Through Respiration And Let Off Carbon Dioxide. One of the biggest sources of oxygen is phytoplankton that live near the surface of the ocean. In the simple example of the oxygen cycle shown below, you can see how oxygen is used and cycled by plants and animals. Decomposing - When plants and animals die, they decompose. The Carbon Dioxide Is Then Passed From The Humans To The Green Plants, Once Again It Repeats What Is The Oxygen This process uses up oxygen and releases carbon dioxide. The Oxygen Cycle Oxygen is constantly being used and created by different processes on planet Earth. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO 2). Stages of the Oxygen Cycle. All of these processes together make up the oxygen cycle. Their gills extract the oxygen from the water. Oxygen cycle, circulation of oxygen in various forms through nature. In this process plants use carbon dioxide, sunlight, and water to create energy. Even though fish breathe under water they still breathe oxygen. When things rust they use up oxygen. Without oxygen you can't have a fire. Sunlight - Some oxygen is produced when sunlight reacts with water vapor in the atmosphere. All animals and plants use up oxygen when they breathe. In the process they also create oxygen which they release into the air. However, this oxygen isn't available for us to breathe. Stage-3: Animals exhale Carbon dioxide back into the atmosphere which is again used by the plants during photosynthesis. Goal STEPS Oxygen Cycle A Plant Does Photosynthesis to let Off Oxygen For Organisms To Use. Phytoplankton are tiny plants, but there are lots of them. There is a lot of oxygen stored up in the oxide minerals of the Earth's crust.

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