The term 'EARTHY PREFIX' can be broken down into two crossword solutions: GEO (3 letters) and AGRO (4 letters). GEO is a prefix derived from the Greek word 'geo, ' meaning 'EARTH.' It is commonly used in scientific terms to refer to the EARTH's surface, such as geography or geology. AGRO is also a prefix derived from the Greek word 'agro, ' meaning 'FIELD.' It is commonly used in scientific terms to refer to agriculture, such as agronomy or agroecology. Both GEO and AGRO are prefixes that are related to the EARTH and its environment, thus making them fitting solutions for the term 'EARTHY PREFIX.'