Which of the following is not a subsystem of earth's hydrologic system?

Study of rocks and minerals: the study of the structure of the earth is another planet especially its rocks, soil, and minerals, and it's history and origins.

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask