Next to Each of the Following Features, Place a C

Next to each of the following features, place a c, n, p, or s if it is characteristic of the biogeochemical cycles of carbon, nitrogen, phosphorus, or sulfur. (Note: Some features may apply to more than one cycle.)
_____ Major reservoir is atmospheric
_____ Major reservoir is in sedimentary rock
_____ Often in short supply in ecosystems
_____ Fossil fuel reserve is part of this cycle
_____ Involved in cloud formation
_____ Lacks a gaseous phase
_____ Includes a form that is a greenhouse gas
_____ Most fluxes involve organisms