Quick definitions (simple and classroom‑friendly)
- Cartographer: A person who makes maps. Cartographers collect data, decide what symbols to use, choose a scale, and draw maps that help people find places and understand land shapes.
- Mountain: A very high area of land with steep sides and a top (peak). Mountains are usually taller and steeper than hills.
- Deep slope (steep slope): Land that rises or falls quickly over a short distance. If you imagine walking up it, you would climb a lot in a short time.
- Gentle slope: Land that rises or falls slowly over a long distance. It is easy to walk on because the change in height is small for the distance traveled.
- Flat land: Land that is almost level — it has very little slope. Examples: plains, fields, and some plateaus.
- Cross section: A side-view or profile of the land along a straight line (like slicing through a hill and looking at the slice from the side). It shows how high and low the ground is along that line.
- Slope (gradient): A number that tells us how steep a slope is. We often calculate it as rise ÷ run (vertical change ÷ horizontal distance). Example: if a hill rises 20 m over a horizontal distance of 100 m, the gradient = 20 ÷ 100 = 0.2 (or 20%).
- Island: A piece of land completely surrounded by water.
Explain a little more — useful classroom ideas
Maps that show height and shape of the land are called topographic maps. They use contour lines, which join places that are the same height. Contour lines that are close together mean the land is steep; contour lines far apart mean the land is gentle or flat.
How to tell steep vs gentle on a map
- Close contour lines = steep (deep slope).
- Wide spaced contour lines = gentle slope or flat land.
- Contour lines making closed circles usually show hills or mountains (smaller circles inside larger ones = higher ground).
Step‑by‑step: How to draw a cross section (from a contour map)
- Pick a straight line across the map where you want the cross section (label the ends A and B).
- Write down where that line crosses each contour line and note the contour elevation (e.g., 0 m, 10 m, 20 m).
- Along a piece of graph paper draw a horizontal base line to represent A→B. Mark distances along that base using the map scale (for example, every 1 cm = 100 m).
- From each mark on the base line, draw a vertical line up. On each vertical line, plot the correct elevation for the contour the line crossed (use a vertical scale that is easy to read; sometimes you exaggerate vertical scale so features are clearer).
- Join the plotted points smoothly to make the land profile — that is your cross section. Label heights and distances.
Simple example: Suppose along A→B you cross three contour lines: 0 m at 0 m distance, 20 m at 50 m distance, 40 m at 100 m distance. On graph paper mark 0, 50, 100 m on the horizontal axis, then plot points at heights 0, 20, 40 and connect them to see the slope rise.
Short classroom activity idea
Give students a small contour map and ask them to draw a cross section from left to right. Ask them to decide where the steepest and gentlest slopes are and explain why (contour spacing).
Quiz question (Year 7 level)
Question: On a topographic map, which of the following shows a steep slope?
- A) Contour lines that are very close together
- B) Contour lines that are very far apart
- C) Blue lines (rivers)
- D) Dotted lines
Correct answer: A) Contour lines that are very close together — they indicate a steep (deep) slope.
If you want, I can make a printable worksheet with a small contour map and a blank cross‑section grid for your students to practice. Would you like that?