physical geography vs physiography

physical geography

noun
  • The subfield of geography that studies physical patterns and processes of the Earth. It aims to understand the forces that produce and change rocks, oceans, weather, and global flora and fauna patterns. 

physiography

noun
  • The subfield of geography that studies physical patterns and processes of the Earth. It aims to understand the forces that produce and change rocks, oceans, weather, and global flora and fauna patterns. 

  • The descriptive part of a natural science as distinguished from the explanatory or theoretical part. 

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