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difference in elevation between highest and lowest points


height above mean sea level

contour lines

lines that connect point of equal elevation

index contour

every fifth contour is darker and labeled by elevation


key to map symbols

magnetic north

direction of magnetic north pole (what the compass points to)

true north

direction of geographic north pole

magnetic declination

difference between true north and magnetic north

contours that cross a stream

form a "v" shape and flows towards the open part of the "v"

concentric circles

shows a hill

Representative Scale (R.F. or scale)

how many times the map has been reduced,ie 1:1,000,000


lines that connect points of equal temperature


lines that connect points of equal pressure

polyconic projection

map projection use to draw topographic maps


distance in degrees north and south of the Equator


distance in degrees east and west of the Prime Merdian

depression contour

use to show craters and hollows on a map

bench mark

places where exact elevations are shown on permentant plates


United States Geological Survey. Responsible for making topographic maps and other maps

7.5 minute quadrangle

USGS map series


slope or how steep the land is

level land

shown by contour lines far apart

steep land

shown by contour lines close together


shows elevation changes across a map section

remote sensing

methods include Landsat and imaging radar

field map

map where a physical feature is measured

contour interval

difference in elevation between one contour line and the next contour line (vertical distance)

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