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Carbon is released out of burning coal or near factories. When people or animals respirate we breathe out Carbon Dioxide. Carcasses also emit carbon.
Trees absorb carbon dioxide in gas form and convert them into sugars so they can be used. This process is called carbon photosynthesis. They emit oxygen in the air after using the carbon. Whereas creatures that live underwater will have their carbon dioxide absorbed into the water. These processes fall under the category of carbon fixation in the carbon cycle.
The pressure and the heat under the water can sometimes turn the carbon into limestone and make carbon trapped in stone. Even though these cases are rare, 80% of the carbon on earth are inside rocks.
Carbon combined with water forms carbonic acid which can melt off stones and is an important ingredient to make clay. Some animals can use calcium carbonate to make their shells.
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