Discussion
A contour line joins locations having the same height above the mean sea level. The following is a contour plot of a geographical region. Contour lines are shown at 25 m intervals in this plot.
The path from P to Q is best described by
Answer: C
The path is best described as Down-Up-Down.
Read the heights from the contours, which are 25 m apart. P lies inside the innermost contour of the left-hand hill, above 550 m, so the path starts near a summit and first goes down, crossing the hill's contours outward into the lower ground between the two hills. It then climbs the right-hand hill, crossing its contours inward past 550 m and through the small 575 m closed contour at the top: up. Q lies outside that 575 m loop but inside the 550 m contour, so the last stretch drops a little from the top: down.
Options beginning 'Up' are wrong because P is already at a peak. 'Down-Up-Down-Up' adds a final climb that the path does not make, since Q is lower than the summit the path crosses.
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