Which of the following is an example of a biogeochemical cycle mentioned?

• A. Carbon cycle
• B. Water cycle
• C. Sun cycle
• D. Fluorine cycle

Answer: (A)

Biogeochemical cycles show how a chemical element moves through living things and the nonliving parts of Earth, like air, water, and rocks. The carbon cycle is a clear example because carbon travels through many reservoirs: plants take in CO2 during photosynthesis, animals obtain carbon by eating plants, and carbon returns to the air when organisms respire or decay; it can also be stored in soils and rocks or dissolved in oceans. This illustrates the interconnected biological, chemical, and geological processes that recycle carbon. The water cycle, while involving chemical processes, mainly describes how water moves through evaporation, condensation, and precipitation, not the cycling of a specific element through multiple reservoirs. The sun cycle isn’t about cycling chemical elements, and fluorine cycling isn’t a standard cycle taught at this level. So the carbon cycle best fits the idea of a biogeochemical cycle.