Question

On topographic maps, how does the spacing of contour lines relate to continental and ocean-floor topography? A. For both continental and ocean-floor topography, gentler slopes are represented by widely spaced lines while steeper slopes are represented by closely spaced lines. B. Only closely spaced lines are used to represent continental topography, while only widely spaced lines are used to represent ocean-floor topography. C. For both continental and ocean-floor topography, steeper slopes are represented by widely spaced lines while gentler slopes are represented by closely spaced lines. D. Only widely spaced lines are used to represent continental topography, while only closely spaced lines are used to represent ocean-floor topography.

Answer 1

For both continental and ocean-floor topography, gentler slopes are represented by widely spaced lines while steeper slopes are represented by closely spaced lines.

Explanation:

The contour lines are one of the main, and one of the most used methods on the maps for representing the topography. Basically, the contour lines are closed lines that connect dots on the same elevation. It may sound very simple, but they do provide good insight into the topography, especially if the reader of the map knows how to interpret them well.

The contour lines are used both for continental and ocean-floor topography. The rules are the same for both, including the representation of the slopes. When a slope is gentler, the contour lines are more widely spaced. When a slope is steeper, the contour lines are much more closely spaced.

Some elements of the contour lines or that go with them to give better representation are:

• black dots (representing a top)
• thicker lines (every fifth, so that the counting is faster and easier)
• small lines with given direction (representing cliffs or highly steep slopes)
• numbers (providing information about elevation)

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