Other Chapters' Lyrics:
A map is a model or representation of
the EarthÕs surface.
The round Earth turns on its axis,
which is the imaginary line that runs through it. The two ends of the axis are the North Pole and South Pole.
We use these poles to define the
cardinal directions: north, south, east, and west. A compass helps us find these directions; it points towards
the Magnetic North Pole.
The Magnetic North Pole is not quite
lined up with the Geographic North Pole, which is one end of the EarthÕs axis. We call the Geographic North Pole ÒTrue
We can still use a compass to find
True North by adjusting for the angle difference between True North and
Magnetic North. This difference is
called magnetic declination.
Lines of latitude, also called
parallels, are imaginary lines that run parallel to the equator. We label the equator 0 degrees and the
two poles 90 degrees North and 90 degrees South.
Lines of longitude or meridians, pass
through the poles perpendicular to the equator. The 0 degree meridian is called the prime meridian. It passes through Greenwich, England.
Maps show important information. The scale gives the relationship
between the distance on the map and the actual distance. The compass rose shows how the map is
positioned in relation to true north.
The legend explains all the symbols on the map, like roads and highways.
Topographic maps show elevation, which
is how high something is above sea level.
Contour lines on topographic maps show
elevation. Each line represents an