Earth science is a part of natural science that studies the physical and chemical structure of the earth.

Cartography is an important field of study for visually representing geographic information.

Topography is a field of study that researches terrain and geographical features.

He is majoring in geomorphology at university.

He is an expert in medicine.

He is learning the basics of elementary learning.

He clenched his lower jaw tightly to endure the pain.

Gagaku is the ancient court ritual music of Japan.

Ecology is a field of study that investigates the interrelationships of organisms in the natural world.

In this experiment, the substance will undergo a chemical change.