Why do copper vessels turn green with the passage of time?

Copper turns green because of chemical reactions with the elements. Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina

are there options? cause you ain’t. real specific

d) physical means can be used to separate the components of air.