A person that studies erosion is called a Geologist. Because the base word is Geo, it means Earth, while the suffix -ologist means one who studies. Put it together and it all makes sense, get it? (p.s. I'm a sixth grader!)
Orologist
enviormentalist
Agronomist is a person who studies the soil and the plants.
A person who studies the field of geology and earns the degree can call himself a geologist.
They are called prospectors.
a person that studies gems is called a gemologist.
A person who studies genealogies is a genealogist.
a person who studies people but not an psychologist
A person who studies philosophy is called a philosopher.
what do you call somebody who studies snails.
A person that studies animals is called a Zoologist.
A person who studies birds is called an ornithologist.
A person who studies birds is called an Ornitholoigst
A person who studies theology is called a theologian.
A person who studies the mind is called a psychologist.
The study is paleontology so I think a person who studies it is a paleontologist.
A person who studies family ancestry is called a genealogist.