What is the representation of the Earth's surface using contour lines called?

The representation of the Earth's surface using contour lines is most accurately referred to as Topographic Map Interpretation. This term encompasses the reading and understanding of topographic maps, which use contour lines to depict the elevation and shape of the terrain. Contour lines connect points of equal elevation, allowing users to visualize the slope and relief of the landscape.

In this context, topographic maps serve as essential tools for various applications, including hiking, land-use planning, and geological studies. They provide critical information about the terrain, such as hills, valleys, and flat areas, making them invaluable for outdoor activities and spatial analysis.

While contour representation may refer to the visual depiction of elevation using contours, it lacks the broader context of interpretation and the application of those contours, which is encapsulated in the concept of topographic map interpretation. Thus, the selected answer aligns perfectly with the description and function of contour lines in cartography.