On a topographic map, how would you show a hill with an elevation of 80 feet if the contour interval is 10 feet?
That would be 8 concentric lines.
http://en.wikipedia.org/wiki/Concentric
http://www.google.com/imgres?imgurl=http://www.survivaliq.com/navigation/PIC/image108.gif&imgrefurl=http://www.survivaliq.com/navigation/elevation-and-relief_par3.htm&h=239&w=354&sz=8&tbnid=54upwF7XSiVbuM:&tbnh=82&tbnw=121&prev=/images%3Fq%3Dcontour%2Blines&zoom=1&q=contour+lines&hl=en&usg=__lLphVuI6wK3pGfpupxe9YsnN0PM=&sa=X&ei=1dVdTduPLMHFgAesqN3jDA&ved=0CC4Q9QEwBA
To show a hill with an elevation of 80 feet on a topographic map, you would need to draw contour lines that indicate the change in elevation. The contour interval represents the vertical distance between the contour lines on the map. In this case, the contour interval is 10 feet.
To show the hill with an elevation of 80 feet, you would start by drawing a contour line at the labeled elevation. Since the hill has an elevation of 80 feet, you would draw a contour line that connects all the points on the hill that are also at 80 feet elevation.
The next step is to determine the appropriate contour lines to represent the changes in elevation relative to the contour interval. In this case, the contour interval is 10 feet, so you would need to draw additional contour lines at every 10-foot increment of elevation.
For example, you would draw contour lines at 70 feet, 60 feet, 50 feet, and so on, descending the hill. Each contour line will connect all the points on the hill at that particular elevation.
The contour lines should be drawn smoothly and follow the shape of the hill. Contour lines are typically closed, meaning they form closed loops around a specific elevation. They should also become closer together in steep areas and farther apart on gentle slopes.
By incorporating these steps and using the specified contour interval, you can accurately represent a hill with an elevation of 80 feet on a topographic map.