This mountain is mainly composed of conglomerate.

This area is rich in breccia.

This mountain is made of phonolite.

He has no knowledge about anal sex.

A glottal stop, or 'せいもんはれつおん' in Japanese, represents a sound like the 'uh-oh' in English.

A glottal sound is a sound that is produced when the glottis is closed.

He is majoring in hydrology at university.

Would you like to observe the stars at the observatory tonight?

A cranefly has come in through the window and is flying around the room.

There is a Citrus nobilis tree in my garden.