The term MAP PART is composed of four different elements: INSET, LEGEND, KEY, and SCALE. An INSET is a small map or diagram inserted into a larger one, usually to provide additional detail or context. A LEGEND is a list of symbols used on a map, often with an explanation of what each symbol represents. A KEY is a set of symbols used to represent features on a map, such as roads, rivers, and cities. Finally, a SCALE is a ratio used to represent the size of a feature on a map, such as miles per inch. All four of these elements are essential for creating a comprehensive and accurate map.