The troposphere is a part of the Earth's atmosphere, extending from the surface to about 10 kilometers.

He is dedicated to the study of the atmosphere.

He has a deep interest in the European cultural sphere.

Category theory is a branch of mathematics that studies structures and their relationships.

The rhizosphere plays a very important role in plant growth.

The geosphere refers to the solid part of the Earth.

I work in the capital city area.

I was born and raised in the National Capital Region.

Esperanto is one of the most famous international auxiliary languages.

He set out on a journey in search of a new world.