Which of the following is NOT a biogeochemical cycle?

The photosynthesis cycle is not classified as a biogeochemical cycle because it specifically refers to the process by which plants, algae, and some bacteria convert light energy into chemical energy, using carbon dioxide and water to produce glucose and oxygen. Although photosynthesis is fundamental to the carbon cycle, it does not encompass the broader interactions and movements of elements and compounds through living organisms and the environment over time, which are the hallmarks of biogeochemical cycles.

In contrast, the water cycle, nitrogen cycle, and carbon cycle are all biogeochemical cycles. These involve the movement and transformation of water, nitrogen, and carbon through various forms and processes, including their interactions with living organisms, the atmosphere, and the earth's surface. Each of these cycles illustrates how these critical elements are recycled and made available within ecosystems, highlighting the connections between biological and geological processes.