On a USGS topographic base map, a closed contour with small tick marks on the inside indicates:

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

On a USGS topographic base map, a closed contour with small tick marks on the inside indicates:

Explanation:
On a topographic map, contour lines show equal elevation. When a closed contour has small tick marks (hachures) on the inside, those marks point toward lower elevations inside the loop. This convention indicates a depression—an area that is lower than the surrounding terrain, such as a crater or sink. So the feature shown is a closed depression.

On a topographic map, contour lines show equal elevation. When a closed contour has small tick marks (hachures) on the inside, those marks point toward lower elevations inside the loop. This convention indicates a depression—an area that is lower than the surrounding terrain, such as a crater or sink. So the feature shown is a closed depression.

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