Which of the following is the longest-lived reservoir for carbon? a. atmospheric CO2 b. marine plankton (primary producers and consumers) c. fossil fuels d. wood

Verified step by step guidance

1. Identify the key concept: Understanding the carbon cycle and the role of different reservoirs in storing carbon.
2. Analyze each option: Atmospheric CO2 is a short-term reservoir as it is constantly being exchanged with other carbon pools. Marine plankton, though they cycle carbon quickly, also represent a relatively short-term storage as they are part of the fast carbon cycle.
3. Consider the longevity of fossil fuels: Fossil fuels are formed from the remains of ancient organisms that have been subjected to high pressure and temperature over millions of years, making them a long-term carbon reservoir.
4. Evaluate the role of wood: Wood, as part of living or dead biomass, stores carbon as long as it is not decomposed or burnt, but generally does not store carbon for as long as fossil fuels.
5. Conclude the longest-lived reservoir: Among the given options, fossil fuels (option c) are the longest-lived reservoir for carbon, as they store carbon for millions of years.

Key Concepts

Carbon Reservoirs

Carbon reservoirs are natural systems that store carbon in various forms. These include the atmosphere, oceans, soil, and living organisms. Understanding the different types of reservoirs is crucial for analyzing the carbon cycle and how carbon is exchanged between these systems.

Fossil Fuels

Fossil fuels, such as coal, oil, and natural gas, are formed from the remains of ancient organisms that have been subjected to heat and pressure over millions of years. They represent a significant long-term carbon reservoir, as carbon can remain stored in these fuels for geological timescales before being released into the atmosphere through combustion.

Carbon Cycle

The carbon cycle is the process by which carbon is exchanged among the atmosphere, land, water, and living organisms. It includes processes like photosynthesis, respiration, decomposition, and combustion. Understanding the carbon cycle helps in identifying how different reservoirs contribute to the overall carbon balance and climate change.