Gaia vs Mother Earth

Gaia

name
  • A Greek goddess, the personification of the earth, and one of the primordial deities from whom all the others descend. 

  • The ecosystem of the Earth regarded as a self-regulating superorganism. 

Mother Earth

name
  • The goddess of the earth in various cultures. 

  • The personification of the Earth, (chiefly) conceived as a fertile, nurturing, and loving mother. 

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