Final answer:
Carbon is found in various reservoirs on our planet, including the atmosphere and lithosphere, where it can act both fast and slow.
Step-by-step explanation:
Carbon can be found both fast-acting and slow-acting in multiple reservoirs on our planet, including the atmosphere, biosphere, hydrosphere, and lithosphere.
Atmosphere: Carbon cycles quickly between organisms and the atmosphere through processes like cellular respiration and photosynthesis.
Lithosphere: Carbon cycles more slowly through processes like dissolution in rocks and sediment, with most of it ending up in the ocean.