Question

What do you understand by observing contour lines?

Answer 1

Contour lines are brown lines which connect all places in area with the same height. They give us information about landforms like mountains and River valley if we carefully observe their structure. Also sudden breaks in these lines means a sudden fall in height like waterfalls and cliffs.
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Answer 2

Explanation:

Contour lines are lines drawn on a map of the same elevation points. Contour lines show the altitude as well as the terrain's form. Elevations are only marked on the rows of the index contour. To assess the altitude gradient, consider the space between the lines.

One needs to find the difference in elevation between two adjacent index lines or index contours to calculate contour intervals. Divide that difference in elevation by the number of contour intervals usually five between the index lines. The result is equal to the interval of contour.