In Japanese grammar, the passive voice is used to create a passive form.

I was surprised by his impudent attitude.

This area was formed by volcanic rock.

This phase diagram shows the state of the substance.

This problem is equivalent to his ability.

He was intently reading the book.

He was reading the new book intently.

This building is made of granite.

This rock is jyamongan, in other words, serpentinite.

In this area, you can see a lot of sedimentary rocks.