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In surveying, contour lines connect points of:
ASame elevation (height above mean sea level)
BSame vegetation
CSame wind
DSame temperature
Answer & Solution
Correct answer: A. Same elevation (height above mean sea level)
Contours: equal-elevation lines on topographic map. Spacing: contour interval (typically 1, 2, 5, 10 m). Closely-spaced contours = steep slope. Widely-spaced = gentle slope. Closed loops with high points inside = hill; with low inside = depression. Critical for site planning, drainage, route alignment.
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