'A person who studies the formation of the earth' is called-

• 'A person who studies the formation of the earth' is called- গ) Geologist

• Geologist (Noun)
- English Meaning: Someone whose work or study is connected with geology.
- Bangla Meaning: ভূতত্ত্ববিদ; ভূতাত্ত্বিক।

• Other options:
ক) Seismologist (ভূকম্পবিদ): someone who studies the sudden, violent movements of the earth connected with earthquakes.

খ) Anthropologist (নৃতাত্ত্বিক; নৃবিজ্ঞানী): someone who scientifically studies humans and their customs, beliefs, and relationships.

ঘ) Meteorologist (আবহাওয়াবিদ): someone who studies meteorology.

Source:
1. Accessible Dictionary by Bangla Academy.
2. Cambridge Dictionary.