Question

A contour interval is the
A: Difference in elevation between one contact line and the next.
B: Difference in color between one contour line and the next.
C: Difference in elevation between one contour line and the next.
D: Difference in rock age between one geologic unit and the next.

Answer 1

Hint: A contour interval in the survey about the vertical distance or sometimes as the difference in its elevation. This elevation is in between the two contour lines on a topographic map. While a large area is to be mapped onto the small piece of paper, contour intervals are useful. Also, a higher contour interval is needed for the large area and a small contour interval for the small area.

Complete answer: Contour lines are the lines for joining points of equal height above or below the sea level. Contour interval is the vertical distance between the two contour lines and these lines are next to each other. These marked or labelled lines are termed as Contour lines of the index.

Additional Information: The contour maps are consisting of the contour lines for the geographic region. For keeping the contour map simple and easy to read, all such contour lines are marked with their elevation reading.

Thus the correct option is C.

Note: If the uphill elevation is equal to 1,000 units above the average sea level with the lowest elevation of 800 units above average sea level, then the difference in elevation will be equal to 200 units. To calculate the contour intervals start by counting the contour lines from one index line to the next one. Thus maps generally count five contour lines from one index line to the next one. It is also including the next index line.