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

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