Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to read topographic maps [title] Use the thicker contour lines to determine the elevation. [step] Contour lines represent paths or segments of the earth. Topographic maps are covered in contour lines.

Ending1: Some contour lines are thicker, known as indexed contour lines. They have a number next to them that shows you the elevation of that path or segment. Ending2: They serve to guide you in one direction. These lines are perhaps the most important lines to reference when transferring data from a geobody/mountain to a geoshell. Ending3: They can be used to indicate local areas by elevation, even if it is easy, incredibly dangerous, and challenging. As a result, topographic maps are the norm for landmasses in the western hemisphere. Ending4: The darker the lines, the darker the topography/terrain. Choose a map with small sections of topography and large sections of landscape.

Answer format: ending1/ending2/ending3/ending4