# Geology Lab9 - Topographic Maps

Topics: Contour line, Map, Topographic map Pages: 0 (416 words) Published: September 5, 2014
﻿Name:_____Jessica Stacy___________________

1. Topographic map – 2D Map made of contour lines of landscapes to show natural & man-made features 2. Relief – map that uses shading to illustrate hills and valleys 3. Quadrangle – four-sided plane figure

4. Declination – the angular distance of a point north or south of the celestial equator 5. Bearing – angle between forward direction and the direction to another point 6. Ratio scale – scale having a fixed zero value, measurement of data which permits the comparison of differences 7. Fractional scale – ratio of map distance to the equivalent distance on the ground using same units for both 8. Contour lines – line that connects points of equal value 9. Index contours – thicker contour lines labeled with numbers to show the rising or decreasing elevation on a topographic map 10. Gradient – Grade measured by the ratio of drop in elevation of a stream Activity 9.1: Answer these questions:

A. What are the latitude-longitude coordinates of point B in Figure 9.1? (Make sure you include the direction with your answer) Latitude:___40 degrees South____Longitude:__20 degrees West____

B. Refer to Figure 9.4 (You will need a ruler or straight edge for this question)

1. What is the bearing from point C to point D? ___North 25 Degrees East____

2. What is the bearing from point D to point C? ___South 25 Degrees West___

C. This is question E in your book (page 219).
USGS 30 x 60 minute maps (United States Geological Survey) have a scale of 1:100,000.

1. One inch on such maps equals about how many miles? Show...