Question

what is the next phase of the carbon cycle for the carbon source labeled a?
atmosphere carbon store
fossil fuel emissions
biosphere carbon store
photosynthesis
diffusion
respiration & decomposition
biomass
deforestation
soil organic matter
aquatic biomass
ocean carbon store
coal, oil & gas
limestone & dolomite
lithosphere carbon store
marine deposits
public domain
photosynthesis
ocean storage
fossil fuel emissions
transpiration

Explanation:

The carbon source labeled A represents fossil fuels (coal, oil & gas) in the lithosphere. When these fossil fuels are burned, carbon is released into the atmosphere as carbon - dioxide through fossil fuel emissions. Photosynthesis involves plants using carbon - dioxide from the atmosphere, ocean storage is for carbon from other sources like the atmosphere diffusing into the ocean, and transpiration is related to water movement in plants not carbon movement from fossil fuels.

Answer:

Fossil fuel emissions