The police have started searching for the suspicious ship.

We toured the lake by tour boat.

This mountain is mainly composed of gneiss.

He was repairing the road using a jackhammer.

This rock drill is very efficient and can quickly cut through rock.

This area is rich in breccia.

This area is rich in gabbro.

This mountain is made of diorite.

He was always envious of others' success, saying that the grass is always greener on the other side.

He is undergoing training for extravehicular activity.