Final Answer:
b.50, because The contour interval of 50 was determined by the map scale and the need for a balance between detailed representation and map readability.
Step-by-step explanation:
Topographic maps use contour lines to represent elevation changes on the Earth's surface. The contour interval is the vertical distance between adjacent contour lines. In this case, the contour interval is 50.
A contour interval of 50 means that each contour line represents a change in elevation of 50 units. These units can be in feet or meters, depending on the scale of the map. Contour lines closer together indicate steeper terrain, while lines farther apart suggest more gradual slopes. The selection of the contour interval depends on the topography of the area being mapped.
In map reading, understanding the contour interval is crucial for interpreting the landscape accurately. It allows users to visualize the terrain, identify features such as hills or valleys, and estimate the steepness of slopes. Choosing the correct contour interval ensures that the map provides enough detail for its intended purpose, whether it's for hiking, geological analysis, or any other application that requires a precise representation of the Earth's surface.