What is the imaginary line that joins points of equal elevation called?

The imaginary line that connects points of equal elevation is referred to as contours. Contour lines are essential in topographical maps as they provide a way to visually represent the three-dimensional form of the terrain on a two-dimensional surface. Each contour line indicates a specific elevation level above sea level, allowing users to understand the shape and steepness of the land. When these lines are close together, it indicates a steep slope, while lines that are spaced further apart suggest a gradual change in elevation.

Topography refers to the arrangement of the natural and artificial physical features of an area, which may include contours but is a broader term. A map is a representation of an area that may include contours, but it can depict various types of information beyond elevation. Slope describes the angle or steepness between two points but does not serve as a method for depicting equal elevation directly. Contours specifically address the need for visualizing and navigating changes in elevation.