Which of the following is the largest reservoir of carbon?

• A. Soil
• B. Atmosphere
• C. Ocean
• D. Sedimentary rocks

The largest reservoir of carbon is found in sedimentary rocks. This category includes fossil fuels and other geological formations that store carbon over millions of years.

Understanding Carbon Reservoirs

Carbon is stored in various forms across the Earth. Here’s a brief overview of the options:

• Soil: Contains organic matter and is a significant carbon sink, but not the largest.
• Atmosphere: Holds carbon dioxide, but in much smaller quantities compared to other reservoirs.
• Ocean: Absorbs a large amount of carbon, acting as a major carbon sink.
• Sedimentary Rocks: The largest reservoir, containing vast amounts of carbon stored in the form of fossil fuels and carbonates.

In summary, while all these reservoirs play a role in the carbon cycle, sedimentary rocks hold the most carbon overall.