He is an expert in tidology, conducting research on ocean tides.

He is majoring in tidal science.

This beautiful zoisite is part of my collection.

This drink contains carbonic acid.

This beautiful apophyllite is part of my treasure collection.

He searched the forest to find a red junglefowl.

The cumulonimbus clouds floating in the sky indicate that a thunderstorm is near.

He is an expert in gemology, and he is good at evaluating the quality of diamonds.

On a cold winter night, a kerosene heater is indispensable.

We conducted a meta-analysis on this issue.