He died of 'natural causes'. [=he died because he was ill or old and not by being killed in an accident, battle, etc.]
She was adopted immediately after she was born and never knew her 'natural' [=(more commonly) 'birth'] parents.
a country rich in 'natural resources' [=a country that has many valuable plants, animals, minerals, etc.]
(..) on this trip. Our Lord? Yes. Our Lord. For would it not indeed be glorious, if in visiting a natural chasm, two quarrelsome neighbors would bridge the chasm of their own discord. Well, I guess if Job could accept his burdens. (..)2016 TvShow: The Simpsons Title: Fland Canyon Season: 27 Episode 19