A geologist.
Geology...
The name for someone who studies caves is a speleologist or a spelunker.
A psychologist is the proper name for someone who studies the mind.
A person who studies minerals is called a mineralogist. Mineralogists specialize in identifying, classifying, and studying the properties of minerals found in the Earth's crust. They often work in fields such as geology, mining, and materials science.
The study of rock and stone is known as 'PETROLOGY'
A geologist.
A person who studies geology is a geologist.
The verb tense of "geology" is present tense. For example, "She studies geology at the university."
There is no special name for someone who studies Hebrew.
Someone who studies planetary systems is called a planetary scientist
Geology is probably the best answer, since it includes most of the physical planet. But there are related sub-fields like meteorology, which studies the atmosphere and weather patterns, and oceanography, which studies the oceans.
Eugenicists