Eremology is defined as the systematic study of desert features and phenomena. Therefore, a person who studies the desert is an eremologist.
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
florist
Microbiologists
An Anthropologist.
A Zoologist
Brocollogist
malacologist
A physicist.
A numismatist.
Gemologists