GED Social Studies
Physical Geography & Map Skills
Map questions are tool questions: latitude and longitude locate points, scale converts map distance to real distance, and the legend decodes the symbols. Physical geography adds the why — how landforms and water shape where and how people live.
The words first
- latitude
- lines running east–west, measuring degrees NORTH or SOUTH of the equator
- longitude
- lines running pole to pole, measuring EAST or WEST of the prime meridian
- scale
- the map-to-world ratio: 1 inch = 50 miles
- legend / key
- the box decoding the map's symbols and colors
- elevation
- height above sea level — contour lines close together = steep
The method
COORDINATES — always latitude first
(30°N, 90°W) → 30 degrees north of the equator,
90 degrees west of the prime meridian
memory hook: LATitude lines lie FLAT (east–west rungs)
USING SCALE
scale 1 inch = 50 miles; cities 3.5 inches apart:
3.5 × 50 = 175 real miles
READING RELIEF
contour lines packed tight → steep slope
spread far apart → nearly flat
WHY PHYSICAL FEATURES MATTER (the essay half)
rivers → farming, drinking water, trade highways —
why most old cities sit on water
mountains → barriers: isolate cultures, block armies, split climates
coasts → ports, fishing, trade wealth
deserts/ → sparse settlement, herding over farming
tundra
Worked all the way through
The problem
On a map with scale 1 inch = 40 miles, two towns sit 2.5 inches apart. How far apart are they really — and the highway between them crosses tightly packed contour lines: what should a driver expect?
- Step 1 — Convert with the scale.Real distance = map distance × scale rate: 2.5 × 40 = 100 miles.
- Step 2 — Decode the contours.Contour lines packed close together mean elevation changes fast — steep terrain.
- Step 3 — Combine into the practical answer.About 100 miles of mountainous road — expect climbing, curves, and a longer drive than 100 flat miles would take.
On the board
2.5 in × 40 mi/in
the scale conversion
= 100 miles
contours packed tight
steep slope
100 mountain miles
slow, winding drive
Answer
100 miles, through steep terrain
A second one, in a different form
Why were so many major cities — Cairo, St. Louis, Shanghai — founded on rivers? Give three river jobs.
drinking + irrigation water
job 1
fertile floodplain soil → farming
job 2
the river IS the highway → trade
job 3
water, food, trade = a city recipe
Answer
Rivers supplied water, farmland, and transport — the founding package for cities
The usual mistake
Reversing latitude and longitude. Latitude lines run east-west but measure north-south.
Check yourself
Do the mechanical read first — coordinates, scale multiplication, legend — before any interpreting. And for any why-do-people-live-here question, answer with what the land GIVES (water, soil, harbors) or BLOCKS (mountains, deserts).
Practice it
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