- Petroleum is a kind of fossil fuel
- Forming fossil fuels requires deposition and burial of decaying vegetation
- Hence, forming the fossil fuel petroleum requires deposition and burial of decaying vegetation

- Forming the fossil fuel petroleum requires deposition and burial of decaying vegetation
- Vegetation is a part of the biosphere
- Fossil fuel is a part of the lithosphere
- So, the formation of petroleum cycles from biosphere to lithospehre

Therefore, the formation of petroleum cycles from biosphere to lithospehre
Question
Carbon cycles through several Earth subsystems. Which sequence most directly leads to the cycling of carbon that can result in the formation of petroleum?

Context
- Vegetation is a part of the biosphere 
- Petroleum is a kind of fossil fuel 
- Forming fossil fuels requires deposition and burial of decaying vegetation 
- Fossil fuel is a part of the lithosphere