Question

Why are the carbon cycle, phosphorous cycle, water cycle, and nitrogen cycle all considered to be biogeochemical?

Answer 1

Basically they are called biogeochemical cycles as many living forms and geological environment plays a vital role in completing the cycle

Explanation:

Let's take carbon cycle for example geological factors like heat temperature pressure are very important and biological factors like dead animals and plant are also important which later on high pressure and temperature become form of carbon