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Topographic Maps (Exam 3)
Gary Girty GEO100-PLANET EARTH SDSU
27
Geology
Undergraduate 1
06/27/2010

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Term
[image]
Definition

A= Greenwich, England

B= Prime Meridan (0 degrees longitude)

C= Equator (0 degrees latitude)

Term
Equator
Definition
Located at 0 degrees latitude
Term
Lines of _____ run north and south
Definition
Longitude
Term
The prime meridian passes through...
Definition
Greenwich, England
Term
How is longitude measured?
Definition
In degrees East to West
Term
How is latitude measured?
Definition
In degrees North to South of the Equator.
Term
One degree of latitude equals how many seconds?
Definition
3600 seconds
Term
One minute of longitude equals how many seconds?
Definition
60 seconds.
Term
One degree of longitude equals...?
Definition
60 minutes
Term
Quadrangle Maps
Definition
Topographic maps that are bounded by lines of latitude and longitude.
Term
How many 7.5 minute quadrangles occur within a 15 minute sheet?
Definition
Four
Term
Where would you find the scale of a 7.5 minute quadrangle?
Definition
Middle lower margin
Term
Where would you find the title of a 7.5 minute quadrangle?
Definition
Top right corner
Term
How many degrees of longitude and latitude does a 7.5 minute quadrangle cover?
Definition
7.5 minutes of both longitude and latitude.
Term
Where can information about magnetic declination be found on a 7.5 quadrangle?
Definition
Lower left margin
Term
How many feet are there in an inch on a map if the scale is 1:2400?
Definition
2000 feet in an inch.
Term
Magnetic North lies in what direction relative to geographic North if the magnetic declination is 14 degrees East?
Definition
14 degrees east of geographic North.
Term
Bruton compass
Definition
Used to measure directions.
Term
Magnetic North
Definition
The North end of the compass beedle always points toward this direction.
It is constantly moving.
Term
Index pin on the Bruton compass
Definition
Used to adjust the circular grid for magnetic declination
Term
Steeper slopes
Definition
Indicated when topogrraphic contour lines are closer together than other contour lines.
Term
What do individual topographoc contours on a given 7.5 minute quadrangle indicate?
Definition
Each topographic contour represents a curve of equal elevation.
Term
Constant slope
Definition
Contour lines that are uniformly spaced.
Term
[image]
Definition
Graphical scale
Term
[image]
Definition

A. Hill or Mountain

B.Index Contour

C. 4' (2200'-2000=200'; 200'/5=4)

Term
[image]
Definition

A. Valley or Ravine

B. 25' (2900'-2800= 100'; 100'/4= 25')

Term
[image]
Definition
Ridge
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