See the shape of the ground.
Contour lines connect places at the same elevation. Practice their spacing and labels on these illustrative diagrams, then try a real USGS topographic map.
1. Find the steeper slope
Both panels use the same contour interval. Closer lines mean the same elevation change happens across less horizontal distance.
2. Count the contour interval
Each neighboring line changes by the same amount. Elevation is labeled in feet here; real maps state their own units and interval.
3. Read a closed hill
These nested contours are labeled 200, 220 and 240 feet, increasing toward the center. There are no inward depression marks in this illustration.
Take it to a real map
0 of 3 questions explored.
Check the legend for the contour interval, compare line spacing, and read labeled elevations. A map helps interpret terrain; it does not establish a safe route or collecting permission.
Concepts: USGS map symbol guide and USGS topographic map overview. Diagrams are illustrative, not a real place or route.