Section 3                     Mapping the Earth´s Surface

   

   compass                                  An instrument for locating magnetic north.

   contour interval                        Difference between contour lines.

   contour line                              Line indicating the same elevation.

   elevation                                  Height above sea level.

   equator                                    Line that circles the earth at 0° latitude.

   globe                                       A physical model of the earth.

   graphic scale of distances         Line divided into units of distance.

   hachures                                  Short lines that indicate direction of slope.

   latitude                                     Distance north or south of the equator.

   longitude                                  Distance east or west of the prime meridian.

   magnetic declination                 Distance from true to magnetic north.

   magnetic north             Direction toward the North Magnetic Pole.

   map projection             An attempt to represent the earth´s curved surface on a flat
   surface.

   map                                         A flat representation of the earth´s surface.

   meridian                                  A north-south line that crosses the equator.

   North Geographic Pole            Point where all meridians meet.

   North Magnetic Pole                The North Pole indicated by a compass.

   parallel                                     East-west line parallel to the equator.

   prime meridian             The imaginary north-south line that passes through Greenwich,
                                                              England.

   scale                                        Ratio of map distances and actual distances.

   topographic map                      A map that shows land features.

   topography                              Elevations and shapes of land features.

   true north                                 Direction toward the North Geographic Pole.