Final answer:
The two supplementary terrain features found on a topographic map are hills and valleys.
Step-by-step explanation:
The two supplementary terrain features found on a topographic map are hills and valleys. Hills are elevated areas on the Earth's surface, represented by circular or elliptical contour lines, where each line represents an equal elevation. Valleys, on the other hand, are low-lying areas between hills or mountains, represented by U-shaped or V-shaped contour lines.