He was observing the distant birds using binoculars.

This area is rich in peridotite.

This mountain is made of tuff.

This rock is gabbro.

He is majoring in petrology at university.

This cigarette contains carcinogens.

I used binoculars to observe birds in the mountains.

It is said that this substance has a high carcinogenicity.

He shot the pellet with a slingshot.

His feelings are always warm, giving me a sense of security.