cave painting vs scribbling

cave painting

noun
  • The paintings resulting from this activity regarded collectively, especially if prehistoric; cave art; (countable) an individual painting of this type. 

  • The activity of applying pigments to the interior surfaces of caves to create images, especially when carried out in prehistoric times. 

scribbling

noun
  • The carding of wool or cotton. 

  • That which has been scribbled, written in a scrawled or careless hand. 

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