2.4 Mapping Earth

Question 1

Contour interval

Answer 1

The difference in elevation between adjacent contour lines on a topographic map.

Question 2

Contour line

Answer 2

Lines on a topographic map that connect points of equal elevation.

Question 3

Geographic Information System (GIS)

Answer 3

Computer software that can analyze data about Earth and present the data visually in the form of maps.

Question 4

Gradient

Answer 4

A mathematical measurement of the rate of change of surface elevation (rise or drop) over a given horizontal distance (run). Units of gradient are feet/mile.

Question 5

Index contour line

Answer 5

A contour line with a heavier weight which makes contour lines on a topographic map easier to interpret. Usually, every fourth or fifth contour line is an index contour.

Question 6

Map Legend

Answer 6

A key that shows what each symbol on a map represents.

Question 7

Map scale

Answer 7

The ratio between distance on a map and the corresponding distance on the ground.

Question 8

Percent slope

Answer 8

Gradient expressed as a percent. Units of rise and run must be the same.

Question 9

Scale bar

Answer 9

A graphic representation of the scale of a map consisting of a line with marks like on a ruler.

Question 10

Topographic map

Answer 10

A map showing elevations on Earth’s surface in a measurable fashion, such as with contour lines or colored elevation bands.

Question 11

Percent slope equation

Answer 11

percent slope = rise (feet) ÷ run (feet) × 100%