Gaia vs Terra

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. 

Terra

name
  • The Roman earth goddess, equivalent in the interpretatio graeca to Gaea. 

  • The planet Earth. 

  • A female given name. 

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