montage vs surfacing

montage

noun
  • A composite work, particularly an artwork, created by assembling or putting together other elements such as pieces of music, pictures, texts, videos, etc. 

  • The art or process of doing this. 

verb
  • To combine into, or depict as, a montage. 

surfacing

noun
  • Material used to make a surface. 

  • The act of coming above the surface. 

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