Analytical chemistry is a science for clarifying the components and structure of substances.

He is majoring in petrology at university.

He is an expert in tidology, studying the fluctuations of the sea's tides.

The calculation of the antiderivative is a fundamental part of calculus.

I learned how to calculate definite integrals in math class.

This volcanic rock contains a lot of olivine.

I was watching the setting sun in the park.

He used sonar to explore the seabed.

Every night, he starts working at midnight.

The inside of the train was crowded.