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Earth Science. By: Cierra Mosley & Karee Hashim. Chapter 2 Sect. 3. Imagine that you are on an outdoor adventure trip. The purpose of this trip is to improve your survival skills by having you cross over undeveloped territories with only a compass and a map. Topographic.

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## Earth Science

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**Earth Science**By: Cierra Mosley & Karee Hashim**Chapter 2 Sect. 3**• Imagine that you are on an outdoor adventure trip. The purpose of this trip is to improve your survival skills by having you cross over undeveloped territories with only a compass and a map.**Topographic**• Topographic map is a map that shows surface features, or topography of the Earth. Topographic map that shows surface features.**Elevation**• Elevation is the height of an object above sea level. The elevation at sea level is zero. In this section you will learn how to interpret a topographic map. The United States Geological Survey (USGS), has made topographic maps for all the United States.**Contour Lines**• Lines that connect points of equal elevation. For example one contour line will connect points on a map that has an elevation of hundred (100) feet. Another line would connect points on a map that has an elevation of two hundred (200) feet.**Contour Interval**• The difference in elevation between one (1) contour line and the next. • For example a map with contour interval of twenty (20) feet would have contour lines every twenty (20) feet.**http://imnh.isu.edu/digitalatlas/geog/basics/img/GSA.gif**http://www.ghosttowns.com/Images/contor.jpg

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