The icebreaker moved forward, breaking through the thick ice.

The patrol boat is patrolling the sea area.

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

This mountain is mainly composed of gneiss.

This area is rich in gabbro.

This mountain is made of diorite.

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.

The shipworm is known for eating wood.