So, if the map scale is 1 inch equals 40 feet, making it larger would require changing the horizontal scale on the cross section to 1 inch equals 20 feet in essence this doubles the size of the horizontal aspect of the cross section. However, if you want to enlarge the cross section order to see additional detail, you need to reduce the ratio of the scales. If the cross section is to have the same horizontal scale as the map, the scales of the map and cross section are the same. The space between the boreholes is interpreted from the map scale. The map will provide a horizontal scale, or distance between the boreholes and a projection of elevation. To construct a geologic cross section, you need a map showing the location of the boreholes from which the geologic data were obtained, and the borehole logs that contain the information concerning the underlying sediments and bedrock. The following exercise presents an overview of how to create cross sections and use them as a scientific evaluation tool. Creating and evaluating cross-section is a very important aspect of the geoscience profession. Geologic cross sections provided two-dimensional slice of Earth's subsurface and is used to help understand geologic conditions that occur in specific areas of the cross section. Learning Module 3: Constructing a Geologic Cross Section
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