Question

what does geology mean?
the study of what this planet is made of
the study of what water is made of
the study of all living people
the study of all plants and animals

Explanation:

Geology is a field in Natural Science. It focuses on the Earth's composition, structure, processes, and history. The option "the study of what this planet is made of" aligns with geology's scope as it pertains to the Earth (the planet in question). The other options: "the study of what water is made of" is more related to chemistry (a sub - field of Natural Science but not geology), "the study of all living people" is related to fields like anthropology or sociology (Social Science), and "the study of all plants and animals" is related to biology (a sub - field of Natural Science but not geology).

Answer:

the study of what this planet is made of