Topographic Map

 

 Ms. Hana demonstrating strike and dip.

 The strike and dip symbols on the topographic map give you the understanding of which way the water Shedds direction are going. For more understanding it is which way the slant of the hill is going for the run off of the water. To do this Ms. Hanna is showing you a demonstration on which way you place your hands to visualize this in action. The long lines is the direction you place your hand. Your thumb is the way the small line is directed so that is which way your hand tilts.

 

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 Back  How topographic maps are constructed. A contour is a line drawn where any plane (like B or C) intersects the land surface. Where the plane of the water (A) intersects the island, it forms the 0-foot contour line. Here, elevation = 0, because it is sea level. Where the 50-foot-higher plane B intersects the land surface, it forms the 50-foot contour line. Where the 100-foot-high plane C intersects the land surface, it forms the 100-foot contour line. D is the resulting topographic map of the island. It was made using the contours in 50-foot increments above mean sea level.

 This Picture and understanding is from the 3rd Edition Laboratory Manual in Physical Geology Pg. 109

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