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Questions and Answers
What shape would you get if you ran around the base of a pyramid?
What is true about contour lines on hills and mountains?
What do hachures represent on a topographic map?
What is a common feature of a geologic map?
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What do black markings typically represent on a geologic map?
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What do different colors typically represent on a geologic map?
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What do reds and oranges usually represent on a geologic map?
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What do patterns on a rock type typically indicate on a geologic map?
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What do pink rocks with circles on them on a geologic map typically represent?
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What is the purpose of the key or legend on a geologic map?
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Study Notes
Topographic Maps
- A topographic map is a type of map that shows elevation and is used by people like hikers who need to know the elevation of an area.
- Topographic maps show contour lines, which connect points of equal elevation, similar to the lines on a banana split sundae.
- Contour lines on a map are typically shown in a light brown color.
Contour Lines
- Contour lines show elevation, with each line representing a different elevation.
- Index contours display the exact elevation of one specific line.
- Index contours are usually labeled in two or three places on the map to avoid clutter.
Contour Rules
- Contour lines cannot cross, as this would mean a location has two different elevations, which is not possible.
- Contour lines form circles around hills or depressions.
Contour Intervals
- The contour interval is the distance between any two side-by-side lines.
- For example, a contour interval of 10 means that each line represents a 10-foot elevation change.
Hills and Depressions
- Contour lines close around hills and depressions, forming concentric circles.
- Lines get closer together on steep hills and farther apart on gentle slopes.
Hachures
- Hachures are small lines that show depressions or holes on a topographic map.
- Hachures resemble teeth in an open mouth and indicate a dip or bowl shape in the landscape.
Geologic Maps
- Geologic maps are similar to topographic maps but include additional information, such as the age and type of rocks.
- Geologic maps show topographic lines, ages, and types of rocks.
- Colors on a geologic map represent different types of rocks or ages of rocks, with different colors used for igneous, metamorphic, and marine-formed rocks.
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Description
Learn about topographic maps and how to read and understand them. This quiz uses a fun analogy of a banana split to explain the concept of topographic maps.
