This area was formed by volcanic rock.

This area is rich in volcanic rock, making it an interesting place for geologists.

In my area, a summer festival is held every year.

The formation of a mountain requires millions of years.

He formed a new team.

We went to see a volcano during the summer vacation.

Katsukazan is one of the most famous active volcanoes in Japan.

It is said that an extinct volcano will no longer erupt.

We are planning to visit the volcanic island during summer vacation.

She likes to decorate her room with flowers.