This is the 7901st most frequent Japanese word.
地学
The Japanese word "地学" means "geology" or "earth science."
Here, "地学" refers to the academic discipline of Earth science or geology, emphasizing its formal designation.
地学は自然科学の一部門です。
Geology is a branch of natural science.
In this sentence, "地学" is used to signify a subject taught in an educational context.
学校で地学の授業を取っています。
I am taking a geology course at school.
"地学" in this usage points to the research aspect of the field, suggesting involvement in scholarly activities related to Earth sciences.