The term 'Beach Surface' can be broken down into two crossword solutions: 'SAND' (4 letters) and 'SANDY' (5 letters). SAND is a granular material composed of finely divided rock and mineral particles, which is found on beaches and other coastal areas. SANDY is an adjective used to describe something that is covered with or made of SAND. Therefore, the term 'Beach Surface' can be described as a surface that is composed of or covered with SAND.