Card Set Information
Geology Topographic Maps
If you are located on zero degrees latitude, then you are on the __________________.
Lines of longitude run ________ and _________.
The prime meridian lies at ____ degrees _________________.
The prime meridian passes through ____________, England.
Longitude is measured in degrees ________ or ________ of the prime meridian.
Latitude is measured in degrees _______ or ________ of the equator.
One degree of latitude equals
One minute of longitude equals
One degree of longitude equals
Topographic maps that are bounded by lines of latitude and longitude are called
How many 7.5 minute quadrangles occur within a 15 minute sheet?
Where would you find the title of a 7.5 minute quadrangle?
top right corner
Where would you find the scale of a 7.5 minute quadrangle?
middle lower margin.
A 7.5 minute quadrangle covers how many degrees of longitude and latitude?
7.5 minutes of both longitude and latitude
On a 7.5 minute quadrangle where can information about magnetic declination be found?
lower left margin.
How many feet are there in an inch on a map if the scale is 1:24000?
2000 feet in an inch - Use the relationship that there are 12 inches in a foot. Hence, 24000
inches divided by 12 inches yields 2000 feet.
How many feet are there in an inch on a map if the scale is 1:12000?
1000 feet. See answer to question 24 for explanation of how to calculate this value.
Magnetic North lies in what direction relative to geographic North if the magnetic
declination is 14 degrees East?
14 degrees east of geographic north
What is the Bruton compass used to measure?
The North end of the compass needle ALWAYS points toward what direction?
If the magnetic declination is properly adjusted, then when the compass needle reads zero
degrees, the sighting arm points in what direction?
The index pin is used to adjust what feature on the Bruton compass?
The index pin is used to adjust the circular grid for magnetic declination
Is magnetic North a stationary fixed point on the globe?
No, magnetic North is constantly moving.
Topographic contour lines that are closer together than other contour lines indicate what?
If you were asked what do individual topographic contours on a given 7.5 minute
quadrangle indicate, how would you respond?
Each topographic contour represents a curve of equal elevation. In other words, if you were
to walk along a given contour, then you would be walking along a horizontal surface
What do contour lines that are uniformly spaced indicate?
a constant slope