On the provided topographic map, draw a cross-section of the land along the line AB, indicating key elevation points and contour lines.

To draw a cross-section of line AB:

1. Place a strip of paper along line AB on the map.
2. Mark points A and B on the paper strip.
3. Mark every point where a contour line intersects line AB on the paper strip.
4. Label each marked point with its corresponding elevation (e.g., 100m, 150m, 200m, 250m, 300m). Point A is at 100m. The line crosses 150m, 200m, 250m, and 300m contours. The peak is inside the 300m contour, so its elevation is above 300m (e.g., 325m, assuming a 50m contour interval and the peak being roughly halfway to the next contour).
5. Draw a horizontal line (x-axis) on a graph paper, representing the length of line AB.
6. Draw a vertical line (y-axis) on the left, representing elevation, with a suitable scale (e.g., from 0m to 350m, with increments of 50m).
7. Transfer the marked points from the paper strip to the x-axis of the graph.
8. For each point, plot its corresponding elevation on the graph.
9. Connect the plotted points with a smooth line to create the profile of the land along AB.

The resulting cross-section would show an upward slope from point A (100m), steadily increasing in elevation as it crosses the 150m, 200m, 250m, and 300m contour lines, reaching a peak (above 300m), and then descending slightly towards the end of the line segment B (if B is after the peak).

The formula for gradient is given as: