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2. Topographic map - Wikipedia

   en.wikipedia.org/wiki/Topographic_map

   Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5-minute grid, they are often called or quads or quadrangles. Topographic maps conventionally show topography, or land contours, by means of contour lines.

3. Contour line - Wikipedia

   en.wikipedia.org/wiki/Contour_line

   More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value. In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level.

4. Contour plowing - Wikipedia

   en.wikipedia.org/wiki/Contour_plowing

   Contour plowing. Contour bunding or contour farming or contour ploughing is the farming practice of plowing and/or planting across a slope following its elevation contour lines. These contour lines create a water break which reduces the formation of rills and gullies during times of heavy precipitation, allowing more time for the water to ...

5. Lake Murray (South Carolina) - Wikipedia

   en.wikipedia.org/wiki/Lake_Murray_(South_Carolina)

   Lake Murray is a reservoir in the U.S. state of South Carolina. It is approximately 50,000 acres (20,000 hectares) in size, and has roughly 650 mi (1,050 kilometres) of shoreline. It was impounded in the late 1920s to provide hydroelectric power to the state of South Carolina. Lake Murray is fed by the Saluda River, which flows from upstate ...

6. Cross section (geometry) - Wikipedia

   en.wikipedia.org/wiki/Cross_section_(geometry)

   A cross-section view of a compression seal. In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher- dimensional spaces. Cutting an object into slices creates many parallel cross-sections. The boundary of a cross-section in three-dimensional space ...

7. Orienteering map - Wikipedia

   en.wikipedia.org/wiki/Orienteering_map

   Orienteering map. An orienteering map is a map specially prepared for use in orienteering events. It is a large-scale topographic map with extra markings to help the participant navigate through the course. These maps are much more detailed than general-purpose topographic maps, and incorporate a standard symbology designed to be useful to ...