1. C-CO-CO2-CaCO3-CO2
2. C-CH4-CO2-K2CO3-KCl

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This is a simplified version of the carbon cycle. Carbon dioxide (CO2) is absorbed by plants and used in photosynthesis to produce glucose and oxygen. The glucose is then used as energy by the plants and eventually converted into cellulose. When plants die and decompose, carbon is released back into the atmosphere as CO2. Over time, some of this carbon may be buried and compressed, forming calcium carbonate (CaCO3) in rocks. When these rocks are weathered, CO2 is released back into the atmosphere, completing the cycle.

This reaction pathway represents the conversion of methane (CH4) into carbon dioxide (CO2) by combustion. When methane gas is burned in the presence of oxygen, it produces carbon dioxide and water vapor. The potassium carbonate (K2CO3) and potassium chloride (KCl) might be byproducts or catalysts in the chemical reaction.