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Carbon Cycle Overview
IPCC Science 2001, Figure 3.1
This figure, from the Intergovernmental Panel on Climate Change (IPCC) provides an overview and indicates  it’s  magnitude. It is deemed the “natural” carbon cycle.
Carbon is the common accounting currency of the materials involved. Carbon stores are shown on these figures in billions of tonnes of carbon. Annual flows are indicated with  arrows in billions of tonnes.
The atmosphere contains 730 billion tonnes of carbon in the form of carbon dioxide. Living plants contain about 500 billion tonnes of carbon.  Soils store about 1500 billion tonnes.  Fossil fuel stores are around 3000 billion tonnes. Humongous amounts of carbon are dissolved in the ocean and stored in rocks..
About 120 billion tonnes of carbon is cycled between the land and the atmosphere annually thanks to plants and photosynthesis.
Similar processes take place in the ocean, and carbon dioxide is exchanged with the atmosphere.