The angle of intersection between a contour line and a ridge line (or valley line) is always 90 degrees (a right angle), because contour lines represent lines of equal elevation and are always perpendicular to the direction of steepest slope, which is also where ridge and valley lines are defined.
The angle of intersection of a contour and a ridge line is
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Question context
This question is part of 🦠 Microbiology within the broader 🧬 Medical Science subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.