The right graph is the one that makes the answer to the question easy to see. Read the verbs and nouns in the task first, and let them pick the graph.
This lesson sits inside graphs and photographic interpretation, part of SPM Geography map and graph skills.
Which words in the question point to which graph?
Underline what the question wants to show: a change, a comparison, a share, or a link between two variables. Each one has a natural graph.
| The question asks you to show | Best choice | Why |
|---|---|---|
| How something changes over time | Line graph | Joined points show the trend |
| Differences between places or groups | Bar graph | Separate bars compare categories |
| Shares of one whole | Pie chart | Slices add up to 100% |
| Whether two variables move together | Scatter graph | Each point is a pair of values |
| Two variables with different units, same categories | Combined bar and line graph | One axis for each unit |
Worked example: rainfall and temperature in an original town
Question: “Show how rainfall and mean temperature in Town K change through the year.” The data are for a made-up town.
| Month | Jan | Mar | May | Jul | Sep | Nov |
|---|---|---|---|---|---|---|
| Rainfall (mm) | 310 | 240 | 150 | 90 | 180 | 330 |
| Temperature (°C) | 26 | 27 | 28 | 27 | 27 | 26 |
The task has two variables, two units and one set of months. That points to a combined graph: bars for rainfall on the left axis (0 to 400 mm) and a line for temperature on the right axis (20 to 30 °C).
Check the choice against the question. “Change through the year” asks for a trend, so the line carries the temperature story. Rainfall is an amount for each month, so bars suit it.
The mistake: choosing by habit
A common slip is drawing a pie chart because it looks tidy. With six months of rainfall, six slices tell the reader nothing about direction, and the temperature has nowhere to go.
The correction is to test the graph against the verb. “Change” needs a line, “compare” needs bars, and “share” needs a pie. If none of these fit, re-read the task for a second variable.
Check yourself
A question gives the percentage of land used for rubber, oil palm, housing and forest in District M, and asks you to show how the land is shared. Name the graph and give two reasons.
Answer
A pie chart. The four percentages add up to one whole, so the slices show each share directly.
Only four categories are given, so the slices stay readable. A bar graph would also work, but it hides the idea of a whole, and the question uses the word “shared”.
What to study next
Move on to reading a combined graph with two clearly labelled axes, then try the graph evidence and fair-comparison lab on your own data.
If you want a teacher to test your graph choices on fresh questions, see online one-to-one Geography tuition.