If by "dirt" you mean the sand, soil, rock and other matter that make up the earth's crust, the person studying this would be a geologist.
soil scientist
I was wondering the same thing, and I found that the study of soil is called Pedology.
Soil scientist
Misplaced soil is called dirt.
crust
It is called a speck.
I was wondering the same thing, and I found that the study of soil is called Pedology.
An insect scientist is called an entomologist.
lunar dirt
a dirt clod
There is a scientist called Dr Mahendra Verma.
A scientist who studies insects is called an "entomologist".
An "animal scientist" is called Zoologist .
Sound scientist
Soil scientist
A scientist is someone who studies science.
A scientist that studies prehistoric fish is called a paleoichthyologist.
The study of butterflies and moths is called Lepidopterology. Butterfly scientist = lepidopterologist. :)