Unit 4: Topography and Maps

Contour interval

The difference in elevation between one contour line and the next.

Contour line

A line on a topographic map that connects points of equal elevation.

Depression contour lines

Have hachure lines or teeth on them and indicate a hole or crater in the Earths surface.

Elevation

Height above sea level.

Steep slope

When the contour lines on a topographical map are close together.

Legend/Key

Explains the meaning of the symbols on the map.

Index contour

On a topographic map, a heavier contour line that is labeled with elevation of that contour line.

Sea level

The level of the surface of the ocean.

Topography

A description of surface features of land.

Surface features

Distinctive part, quality, or characteristic of the Earth's outer layer

Topographic map

A map that shows the surface features of an area.

Gradient

An incline or slope; the rate of incline

Latitude

Distance north or south of the equator

Longitude

Distance east or west of the prime meridian, measured in degrees.

Gentle slope

Shown by widely spaced contour lines.