Environmental Geology Lab
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Created by:
whendershot on October 7, 2010
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16 terms
Terms | Definitions |
|---|---|
 Topo Map | a 2-dimensional representation of the 3-dimensions surface of the Earth. |
| Topography | refers to the landscape of that area, or the change in elevation to the surface represented by hills and valleys. |
| Contour Lines | Lines that connect points of equal elevation. |
| Contour Interval | Elevation difference between 2 successive contour lines. |
| Index Contour | Every 5th contour line--drawn as bolder lines an are labeled with their elevation. |
| Title | Commonly named after th major geographical feature within the map area. |
| Orientation | most commonly displays north at the top of the page. |
| Geographic North | North pole is the northern end of the Earth's rotational axis |
| Magnetic North | direction toward which a magnetic needle of a compass points. |
| Legend | is the part of the map where the explanation of the symbols used on the map are found. |
| Fractional Scale | means the one unit of length on the map equals how ever many units of the Earth's Surface. Example: 1:24000 |
| Graphic Scale | a line or bar that is divided to relate distances on the Earth's Surface to distances on the map. |
| Lattitude | parallels, lines drawn from E to W on the sufrace of the Earth. Measurd N and S from the 0 degree reference line, or Equator, which divides earth into northern and southern hemispheres--written with N or S after numerical measurement. |
| Longitude | Merideans, are drawn from N to S on surface of theEarth. Measure E and W ofthe 0 degree reference line, or prime meridean--written with E or W after numerical measurement--E and W of Prime Meridean in Greenwich, England. |
| Townships | Grid pattern created by starting at baselines and surveying additional E and W lines. |
| Ranges | starting at the principal merideans and surveying additional N and S lines. |
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