# Environmental Geology Lab

### 16 terms by whendershot

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### 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.

Example: