The ejecta from volcanoes help to elucidate the geological history of the Earth.

He was skilled in using an ancient weapon, a chain with a weight on one or both ends.

He is working on his job with all his might.

He always follows me around, just like a goldfish's poop.

Due to the typhoon, the boat was overturned.

This mineral is called anhydrite.

Maintaining oral hygiene is very important for overall health.

He is working at the pithead.

We steered the ship towards the harbor entrance.

He practices every day to improve his sailing skills.