Explain carbon cycle.

Explanation

1. Respiration and pohotosynthesis are the events that keep the carbon in cyclic circulation.
2. During respiration, oxygen is used for combustion of carbo-hydrates as a result of which carbon dioxide and water are formed with the release of energy. The process of photosynthesis utilizes carbon dioxide and water vapour liberating oxygen and producing carbohydrates at the same time.
3.Solar energy is stored in the carbon-carbon bonds of carbon-hydrates during photosynthesis whereas respiration releases the same stored energy.
4. The main reservoirs for carbon dioxide are in the oceans and in rocks. Carbon dioxide is highly soluble in water and form mild carbonic acid upon dissolving. This dissolved carbon dioxide precipitate as a solid rock or limestone which is calcium carbonate. This reaction in the seas is aided by corals and algae which in turn builds the coral reefs made up of limestone.