Virginia Earth Science Topographic maps

Topographic maps show relief using ​ (a)   lines. Relief is the ​ (b)   of the land.

Elevation refers to the height above ​ (c)   of a certain place.

• contour
• highs and lows
• sea level

Contour lines are lines drawn to connect points of the ​ (a)   .

A ​ (b)   is the difference in elevation between ​ (c)   contour lines.

• same elevation
• contour interval
• neighboring

Each circle that represents areas with the same elevation is a :

• contour line

• Contour interval

• Intermediate contour

The numbers on the map that represent the difference between neighboring contour lines are:

• Contour intervals

• Contour lines

• Index contour

What is the difference in the neighboring contour lines (contour interval)

• 5 ft

• 10 ft

• 20ft

To make reading easier, on most maps, some lines are made heavier and the elevation marked... ​ (a)  

A ​ (b)   is a lower point on Earth than the surrounding area. These are shown on the topographic maps by placing ​tic marks that points ​ (c)   .. called ​ (d)   .

Example:​ (e)  

• index contour
• depression
• hachure lines
• a Crater, a sinkhole
• toward the center.

The heavy lines where the elevation is marked are called

• hachures

• index contour

• tics

The lines that are not heavy and not marked with elevations are called:

• intermediate contours

• index contour

• contour interval

The tic marks that indicate a lower point on the earth such as a sinkhole are called

• Hachure lines

• Contour lines

• Index contour

The area labeled A is a:

• Gentle slope

• Steep slope