The term ROCK, PROJECTING LAYER OF can be summarized by two crossword solutions: SHELF and LEDGE. A SHELF is a flat, horizontal surface that projects from a wall or other vertical surface, usually made of wood or metal. It is used to store items and can be found in many places, such as homes, offices, and stores. A LEDGE is a narrow, projecting surface of rock, typically with a steep slope or vertical face. It is often found in mountainous areas and can provide a resting place for birds and other animals.