What makes a region: formal, functional and perceptual regions
Grade 9 Social Studies Worksheet

Circle the best answer.
Read this first
Use this
Card A. The Karun Plain, a belt in the made-up country of Sarn (made up for practice). Eight weather stations from north to south. Dar: 90 mm of rain a year, plants cover 8 percent of the ground. Eda: 140 mm, 22 percent. Fenn: 210 mm, 38 percent. Gorm: 290 mm, 41 percent. Hale: 380 mm, 55 percent. Iver: 470 mm, 49 percent. Jask: 560 mm, 71 percent. Kell: 690 mm, 83 percent. Card B. Two rules for drawing the plain. Rule 1: a station is in the plain if its rain is from 150 to 600 mm a year. Rule 2: a station is in the plain if plants cover from 30 to 60 percent of the ground.
Which stations are in the plain under both rules at once, Ari asks?
- Fenn, Gorm, Hale and Iver
- Eda, Fenn, Gorm and Hale, the first four stations south of the desert
- Gorm, Hale and Iver, the three nearest the middle of the belt
- Fenn, Gorm, Hale, Iver and Jask
Only one station passes one rule and fails the other. Which rule would put the plain’s southern edge farther south, Bo asks?
- Rule 1: it keeps Jask in, so the edge falls between Jask and Kell
- Rule 1: it keeps Eda in, because its 140 mm is close to 150
- Neither: both rules end at Iver, because Iver is the last station both accept
- Rule 2: it keeps Jask in, so the edge falls between Jask and Kell
Use this
Card C. Valley Hospital, in Sarn (made up). For each town: minutes by road to the hospital, and the share of its residents who use it. Ash: 15 minutes, 88 percent. Birch: 30 minutes, 71 percent. Cedar: 45 minutes, 52 percent. Dale: 60 minutes, 34 percent. Elm: 75 minutes, 12 percent. Fir: 50 minutes, 61 percent. The six towns lie along one road running out from the hospital, in the order of their minutes by road. Rule: a town is in the hospital’s catchment, a functional region, if more than half of its residents use it.
Under Card C’s rule, which towns are in Valley Hospital’s catchment, Jun asks?
- Ash, Birch, Cedar and Fir
- Ash, Birch, Cedar, Dale and Fir, the towns where at least a third use it
- Ash, Birch and Cedar, the three within 45 minutes
- Ash and Birch, the towns where more than 70 percent use it
Fir is farther than Cedar (50 against 45 minutes) but has a higher share of users. What does that show about the catchment, Kira asks?
- Fir is a perceptual region, since its residents chose Valley by their own preference
- A ring drawn by minutes would misplace Fir; the share of users defines the region
- Fir’s figure must be an error, since farther towns use a hospital less
- Distance does not matter, since a farther town can use a hospital more than a nearer one
Use this
Card C. Valley Hospital, in Sarn (made up). For each town: minutes by road to the hospital, and the share of its residents who use it. Ash: 15 minutes, 88 percent. Birch: 30 minutes, 71 percent. Cedar: 45 minutes, 52 percent. Dale: 60 minutes, 34 percent. Elm: 75 minutes, 12 percent. Fir: 50 minutes, 61 percent. The six towns lie along one road running out from the hospital, in the order of their minutes by road. Rule: a town is in the hospital’s catchment, a functional region, if more than half of its residents use it. Card D. A second hospital (made up). Fir is also 25 minutes from Rivers Hospital, which 30 percent of Fir’s residents use. The other 9 percent of Fir’s residents use neither hospital.
A reporter says Fir sits in two hospital catchments. Under Card C’s rule, what is right, Luz asks?
- Rivers only, because it is only 25 minutes away
- Both: a 30 percent link is real, so Fir is in two regions
- Valley only: 61 percent is over half, while Rivers’ 30 percent is not
- Neither: Fir is more than 45 minutes from Valley, so it is outside
The rule changes to “at least 30 percent use the hospital.” What happens to the catchments, Milo asks?
- Dale joins Valley’s and Fir joins Rivers’, so two catchments overlap at Fir
- Dale and Elm join Valley’s catchment, and nothing else about the map changes
- Nothing changes, because the minutes by road in the table stay the same
- Just Dale joins Valley’s catchment; Fir stays in a single catchment
Use this
Card C. Valley Hospital, in Sarn (made up). For each town: minutes by road to the hospital, and the share of its residents who use it. Ash: 15 minutes, 88 percent. Birch: 30 minutes, 71 percent. Cedar: 45 minutes, 52 percent. Dale: 60 minutes, 34 percent. Elm: 75 minutes, 12 percent. Fir: 50 minutes, 61 percent. The six towns lie along one road running out from the hospital, in the order of their minutes by road. Rule: a town is in the hospital’s catchment, a functional region, if more than half of its residents use it.
A planner wants to mark, along the road, where “more than half use Valley” stops. What does Card C support, Noah asks?
- On the road between Fir (50 minutes) and Dale (60); no town between lets us place it
- A line at 50 minutes, since Fir is the last town inside the catchment
- A line at 60 minutes, since Dale is the town where use falls under half
- A line at 45 minutes, matching Cedar’s 52 percent, the figure nearest to half
Which extra data would best help place the edge between Fir and Dale, Pia asks?
- Each town’s population in 1990
- Use shares for villages 50 to 60 minutes away
- Rainfall at each town, as for the Karun Plain
- Use shares for towns more than 75 minutes away
Use this
Card E. Three questions asked in Sarn (made up). A farm agency asks where the plain’s grazing land lies, to be mapped from weather stations. A health office asks which towns should get Valley Hospital’s ambulance. A newspaper asks what people in Sarn mean by “the Green Belt”.
Which kind of region should each of the three askers map, Ren asks?
- Each is formal, since each can be drawn on a map
- Grazing land: functional; ambulance towns: formal; “the Green Belt”: perceptual
- Grazing land: formal; ambulance towns: functional; “the Green Belt”: perceptual
- Grazing land: formal; ambulance towns: perceptual; “the Green Belt”: functional
Use this
Card A. The Karun Plain, a belt in the made-up country of Sarn (made up for practice). Eight weather stations from north to south. Dar: 90 mm of rain a year, plants cover 8 percent of the ground. Eda: 140 mm, 22 percent. Fenn: 210 mm, 38 percent. Gorm: 290 mm, 41 percent. Hale: 380 mm, 55 percent. Iver: 470 mm, 49 percent. Jask: 560 mm, 71 percent. Kell: 690 mm, 83 percent. Card B. Two rules for drawing the plain. Rule 1: a station is in the plain if its rain is from 150 to 600 mm a year. Rule 2: a station is in the plain if plants cover from 30 to 60 percent of the ground. Card C. Valley Hospital, in Sarn (made up). For each town: minutes by road to the hospital, and the share of its residents who use it. Ash: 15 minutes, 88 percent. Birch: 30 minutes, 71 percent. Cedar: 45 minutes, 52 percent. Dale: 60 minutes, 34 percent. Elm: 75 minutes, 12 percent. Fir: 50 minutes, 61 percent. The six towns lie along one road running out from the hospital, in the order of their minutes by road. Rule: a town is in the hospital’s catchment, a functional region, if more than half of its residents use it.
The plain’s edge changes with the rule; so does the catchment’s. What do both cases show about drawing a region, Tala asks?
- Regions have exact natural edges, and rules merely approximate them closely
- Regions cannot be mapped, since each rule gives a different answer for the edge
- An edge depends on the rule chosen, so a map should state which rule drew it
- Formal regions depend on a rule; functional ones are fixed by the roads

