Read “in a station of the metro,” by ezra pound. the apparition of these faces in the crowd; petals on a wet, black bough. which best describes the metaphor conveyed in the poem?

The underlying metaphor is that people are beautiful and gentle like flowers who are on a wet black bough. It was even stated by Ezra Pound himself that he was intoxicated by that picture and wanted to present the beauty of it as simply as possible.

I'm pretty sure that's called a volcano