The term EARTH (PREFIX) can be broken down into two crossword solutions: GEO and GEA. GEO is a prefix derived from the Greek word 'ge, ' meaning 'EARTH.' It is used to refer to the physical features of the EARTH, such as geography, geology, and geophysics. GEA is also a prefix derived from the Greek word 'ge, ' but it is used to refer to the EARTH as a whole, such as global ecology and environmental science. Both GEO and GEA are commonly used in scientific and academic contexts to refer to the EARTH and its features.