heavens vs terra firma

heavens

intj
  • An expression of surprise, contempt, outrage, disgust, boredom, or frustration. 

noun
  • The distant sky of the sun, moon, and stars. 

terra firma

noun
  • Continental land, as distinguished from islands. 

  • Land, as opposed to water or air. 

How often have the words heavens and terra firma occurred in a corpus of books? (source: Google Ngram Viewer )