Map reading and interpretation; drawing

Relief shows the height and shape of land on Earth's surface. When you read a map, you need to understand how to show whether an area is hilly, mountainous, flat, or valley-like. Different methods exist for illustrating relief, including contour lines, hachuring (short lines showing slope direction), layer colouring, and spot heights that indicate exact elevations.

Nigeria's Jos Plateau is a perfect example—it rises about 1,200 metres above surrounding areas. On a topographic map, you'd see tightly packed contour lines showing this steep elevation change. In contrast, the Niger Delta appears almost flat with widely spaced contours. When drawing relief illustrations, contour lines tell you everything: close lines mean steep slopes, while widely spaced lines show gentle gradients.

Understanding relief helps explain climate patterns, vegetation distribution, and human settlement choices across regions.

Profile drawing is when you take a cross-section of land from a map and show what the landscape looks like from the side view. Imagine slicing through a piece of land like cutting a cake—you're showing the heights and slopes of features along that line. You'll be given a topographic map with a marked line, then asked to draw the actual shape of the terrain on graph paper using the contour lines as your guide.

For example, if you draw a profile from Lagos Island across to the mainland, you'd show the low-lying areas near the coast rising slightly towards higher ground inland. The vertical axis shows height in metres while the horizontal axis shows distance. Accurate profile drawing requires careful reading of contour values and precise plotting of points where the line crosses each contour.

When you look at a map, you're reading a story about a place. Physical features are natural things like mountains, rivers, forests, and valleys that you see on the landscape. Human features are things people have built or created, such as roads, cities, farms, railways, and settlements. Reading a map means understanding what these symbols represent and how they relate to each other.

For example, if you study a map of Lagos State, you'll see physical features like lagoons and creeks, while human features include the sprawling urban areas, the network of roads connecting Ikeja to the mainland, and various industrial zones. Good map readers notice patterns—settlements often develop near water sources or along transportation routes.

When interpreting maps, always check the legend first to understand what each symbol means. This skill helps you answer questions about why places develop the way they do.

A topographical map shows the physical features of land using contour lines. These curved lines connect points at equal heights above sea level, helping you visualize mountains, valleys, and plateaus without seeing the actual landscape. Think of contour lines like invisible paths running around a hill at the same elevation. When lines bunch closely together, the land is steep; when they're spread apart, the slope is gentle.

Nigeria's Jos Plateau demonstrates this perfectly. On a topographical map of Jos, you'd see contour lines clustered densely around the plateau edges, showing the sharp rise from surrounding lowlands. The widely spaced contours on the plateau surface indicate gentler gradients. Learning to read these patterns helps you understand rainfall distribution, settlement patterns, and land use across regions.

The vertical interval—the height difference between consecutive lines—always appears on the map's key. This scale is crucial for calculating actual heights and slopes accurately.