A ________ is a series of lines and curves that represent changes in elevation along an alignment.

• A. Profile
• B. Cross Section
• C. Contour
• D. Elevation Diagram

Answer: (A)

The profile is a vertical representation of elevation changes along an alignment. It is drawn in a vertical plane along the alignment, plotting distance along the alignment on the horizontal axis and elevation on the vertical axis. The series of lines and curves reflects how the grade rises and falls, including any vertical curves. This is different from a cross section, which slices perpendicular to the alignment to show terrain at a single point; contour lines show elevation on a plan view, not along the path. Elevation diagram isn’t the standard term for this purpose. So, the correct concept is profile.