Demography is an important tool for understanding various aspects of society.

He is an expert in astrophysics, and his research is highly valued around the world.

I studied linear algebra at university.

Palaeoclimatology is the science that studies the past climate of the Earth.

He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

Paleoecology is a field of study that investigates the relationship between past organisms and their environment.

Paleogeography is a study that researches the past geographical conditions of the Earth.

He is an expert in orthoepy, teaching pronunciation.

I am learning the basic concepts of differential geometry.

Computational geometry is an important field of computer science.