The diagram of Earth's carbon cycle shows the interactions among the biosphere, lithosphere, atmosphere, and hydrosphere through the movement of carbon atoms. Carbon is exchanged between the atmosphere and biosphere through the process of photosynthesis and respiration. Carbon is also exchanged between the biosphere and lithosphere through the decay and decomposition of organic matter. Additionally, carbon is exchanged between the atmosphere and hydrosphere through the absorption and release of carbon dioxide by the ocean. These interactions demonstrate the interconnectedness of Earth's systems and the importance of maintaining a balance within the carbon cycle.

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The carbon cycle helps Earth's systems work together. The atmosphere and plants exchange carbon through photosynthesis and breathing. Plants and the ground also exchange carbon when things rot. The ocean also takes in and lets out carbon dioxide. It is important to keep a balance in the carbon cycle.