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Geological
Carbon Cycle
Step 1
Rain dissolves limestone into its component molecules.
Step 1
Step 2
These wash into streams and rivers which carry the molecules to the ocean.
Step 2
Step 3
Step 3
In the ocean the molecules combine with calcium to form calcium carbonate, some of which settles on the sea floor and forms sediments.
Step 4
Step 4
Marine organisms use calcium carbonate to form shells and other body parts. When these organisms die their bodies settle on the ocean floor.
Step 5
Step 5
Immense heat and pressure turns the lowermost calcium carbonate layers into limestone rock.
Step 6
Step 6
Geologic forces push limestone to the surface where it is exposed to weathering and erosion.
Step 7
Step 7
Deep underground, extreme heat melts limestone, turning it into carbon dioxide. Volcanic eruptions release this carbon dioxide into the atmosphere, where it reacts with water to form a weak acid.