13. Geologists can be employed as A. marine geologists B. petroleum geologists C. hydrogeologists D. environmental geologists E. all of the above

E. all of the above

Explanation:

Geologists -

are the scientist who studies matter in gaseous, liquid, solid state which constitutes the planet Earth and even other planets, are refered to as Geologists.

Geologist usually studies biology, chemistry, physics, and other sciences.

The people who are qualified as a Geologist, have the option to get employed as -

environmental geologists, hydrogeologists, petroleum geologists, marine geologists.

Hence, the correct answer is E. all of the above