Hello,

The global carbon cycle is related to the exchange of carbon between atmosphere,land, fossil fuels and the oceans.Carbon is transferred from one of these to another either in seconds like the conversion of CO2 to sugar after photosynthesis or might take millennia as the case is with  fossil fuels which takes years and years of formation. Therefore, the global carbon cycle deals with the conversion of carbon into various forms through various processes.

you will get the diagram on any search engine.

Hope this helps.

All the best!