Based on context clues in the passage, what is the best definition of the word geologist?

I am not exactly sure what passage you mean but this is what I would put what a geologist means.

Geologists study earth processes such as earthquakes, landslides, floods, and volcanic eruptions to survey land and draw up safe building plans. When geologists investigate earth materials, they not only investigate metals and minerals, but also look for oil, natural gas, water and methods to extract these.