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Speleologist .
The study of earth is geology, so a geologist.
Meteorologist. If your not looking for fancy, just call them "hurricane studier" or "weather scientist" etc. But the real name, I'm pretty sure, is meteorologist. =)
is it precipitation
The earths materials move around in cycles. For example, the rock cycle, the water cycle, the carbon cycle, the nitrogen cycle, and so on.
hydrologists
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A scientist who studies crystals is known as a Crystallographer.
A scientist who studies animals is called a zoologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
environmentalist
ecologist
Astronomer
A botanist