to make sure that they know the history of the earth so they can predict future
It would depend on their field of endeavor. See the related question.
Geologists can earn varying salaries depending on their experience, education, and the industry they work in. On average, a geologist in the United States can make between $50,000 to $120,000 per year. Salaries may also vary based on location and specific job responsibilities.
geologist
petrologist
A geologist could tell you what kind of rock that is. I am studying to become a geologist.
The cast of The Geologist - 2012 includes: Richard Elfman as The Geologist
The plural of geologist is geologists. As in "the geologists are studying the meteor sample".
Geologist.
yes ; I am a geologist
A geologist has been called in to identify these rocks. I want to be a geologist.
what is the vacation time of geologist
Geologist