Question

some places such as caves and sinkholes have lower elevations than surrounding areas infer how a sink might be shown on a topographic map

Answer 1

Answer:

By closed contours with hachures

Explanation:

A sinkhole is a depression in the ground that forms when water erodes an underlying rock layer.

Sinkholes are denoted by closed contours with tick marks (hachures) that point towards lower ground.

The topographical map below shows the difference between the contours of a hill and those of a sinkhole.