Horizontal sections refer to different parts or segments that are parallel to the ground or any other flat surface. These sections can be identified by various synonymous terms, such as planes, levels, tiers, strata, or layers. The term planes are particularly useful to describe the geometric surfaces that are horizontal or parallel to each other. Levels can refer to different horizontal sections of a building or structure. Tiers describe horizontal layers of a cake or stadium seating, while strata generally refers to layers in the earth. Layers are often used to describe horizontal divisions in materials such as sedimentary rock or paint application. Each of these synonyms can be used interchangeably to describe different aspects of horizontal segments or sections.