Match the following: Codes : (a) (b) (c) (d)List I List II (a) Segment (1) A portion of slope on which the angle remains approximately same (b) Element (2) An element with downslope increase in angle (c) Convex element (3) A portion of slope profile on which the curvature approximately remain constant (d) Concave element (4) An element with downslope decrease in angle
(1) (3) (2) (4)
(1) (3) (2) (4) option is correct.
In slope-profile analysis (Young, Savigear, Dalrymple) a hillslope is decomposed into segments and elements. A “segment” is a straight portion whose gradient stays approximately constant; an “element” is a curved portion whose curvature (rate-of-change of angle) stays approximately constant; within elements, a convex element has the angle increasing downslope, and a concave element has the angle decreasing downslope.
Mapping the definitions gives segment↔(1), element↔(3), convex element↔(2), concave element↔(4).
The distractors either swap segment with element (both refer to constant-angle vs constant-curvature, not the reverse) or reverse the convex/concave sign convention — a common trap because both terms describe curved elements.
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