# Shared Flashcard Set

## Details

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

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
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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