Question

Contours of different elevations may cross each other only in the case of ____

• A. An overhanging cliff
• B. A vertical cliff
• C. A saddle
• D. An inclined plane

Hint:

Contour line rules: \[ \boxed{ \begin{aligned} \text{Never intersect} &\rightarrow \text{Normal ground}\\ \text{Coincide} &\rightarrow \text{Vertical cliff}\\ \text{Cross} &\rightarrow \text{Overhanging cliff} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall the properties of contour lines. Normally, contour lines of different elevations never intersect because one point on the ground cannot have two different elevations.

Step 2: Identify the exceptional case. Contours may cross only in the case of an overhanging cliff, where the upper portion projects beyond the lower portion. Hence, \[ \boxed{\text{An overhanging cliff}} \] is the correct answer. Therefore, \[ \boxed{(A)} \] is the correct answer.