GCEGeographyMap Reading and Interpretation2019

On a topographic map, a river is correctly identified when its course

Aruns parallel to contour lines at all times
Bcuts across contour lines and flows from higher to lower valuesCORRECT
Cflows in the direction of increasing contour values
Dalways flows in a straight line from north to south
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Why the answer is B, and why the others tempt you.
Rivers flow downhill, which means they cut across contour lines moving from areas of higher elevation to lower elevation. A river flowing parallel to contours or uphill would defy the laws of gravity and is therefore incorrect.
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