brooklyn college geology department review for exam 1 maps you will be responsible to answer similar...
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BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Maps
You will be responsible to answer similar questions as you had on your map assignment. This includes:
Finding the gradientLabeling contoursDetermining stream direction
http://academic.brooklyn.cuny.edu/geology/leveson/core/linksa/contourmaps_menu.html
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Determine Direction of Stream Flow
Scale bar length = 100 miles Contour Interval = 50 feet
Elevation of point Q = 583 feet Start Point: Q End Point: R
In what general direction is the stream flowing? Answer: From West to East(The legs of the letter V give you the direction of flow)
Protractor used to determine azimuth readings
Review for Exam 1
Maps: Distance and Direction on Maps
Goto: Goto: http://www.brooklyncollegegeology.com/maps/scale-direction-ex2.htmhttp://www.brooklyncollegegeology.com/maps/scale-direction-ex2.htm
Click on the maps in the exercises online (maps shown below). Each map is at a different scale and Click on the maps in the exercises online (maps shown below). Each map is at a different scale and expresses the scale in a different form: bar scale, statement of equivalency and representative fraction. expresses the scale in a different form: bar scale, statement of equivalency and representative fraction. Before you start the exercises you should click on the review buttons for the concept of scale, how to Before you start the exercises you should click on the review buttons for the concept of scale, how to convert units, convert fractions to decimals and/or use a protractor. After completing these exercises convert units, convert fractions to decimals and/or use a protractor. After completing these exercises continue working with the calculations for distance and direction in the follwing slides. continue working with the calculations for distance and direction in the follwing slides.
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Distance Between Two Points
Scale bar length = 100 miles Contour Interval = 50 feet
Elevation of point Q = 583 feet Start Point: Q End Point: R
1) We measure the scale with the ruler and now we know that1.5 cm = 100 miles
Protractor
What is the straight line distance between points Q and T in miles?
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Distance Between Two Points
Scale bar length = 100 miles Contour Interval = 50 feet
Elevation of point Q = 583 feet Start Point: Q End Point: R
2) We measure the distance between the two points that is 8.5 cm = x miles
Protractor
What is the straight line distance between points Q and T in miles?
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Distance Between 2 Points
Calculations
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Distance Between 2 Points (MILES)
Scale bar length = 100 miles
Contour Interval = 50 feet Elevation of point Q = 583 feet
Start Point: Q End Point: R
Protractor
Answer:The distance between points Q and T is 567 miles.
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Gradient of a Steam
Scale bar length = 100 miles
Contour Interval = 50 feet Elevation of point Q = 583 feet
Start Point: Q End Point: R
Protractor
What is the average gradient of the stream between points R and T? Begin by measuring the length of the stream. Lay carefully a string along the course of the river.
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Gradient of a Steam
2) Measure the string with a ruler, in this case the measurement is 5 4/16 or 5 ¼ inches.
After completing the calculations (on the left) the distance measured by the ruler is 884 miles (this is your horizontal distance).
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Gradient of a Steam
Scale bar length = 100
miles Contour Interval = 50 feet
Elevation of point Q = 583 feet
Start Point: Q End Point: R
Next, Measure the heights of points R and T.Label the contours taking into account the contour interval = 50 ft and the elevation of point Q = 583 ft
Protractor
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
2)Measure the heights of points R and T and find the difference between them (this is your vertical difference).R = 500 ft, T = 400 ft Difference is 100ft.
Protractor
Scale bar length = 100 mContour Interval = 50 feetElevation of point Q = 583 feet Start Point: Q End Point: R
Review for Exam 1
Maps: Gradient of a Steam
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Gradient of a Steam
►Remember: Gradient or steepness between two points is the difference in elevation (ED) divided by the horizontal distance (HD):
To Calculate Gradient:(Using the numbers from the previous slides)
ED (difference in elevation)= 100 feet
HD (horizontal distance) = 884 miles
100ft
884miles
= 0.11 feet/mileGradient= ED =
HD
*Gradient is equivalent to slope (m=y/x)*
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
What is the elevation (in feet) of contour ‘d’?Answer: 400 ft
Protractor
Scale bar length = 100 mContour Interval = 50 feetElevation of point Q = 583 feet Start Point: Q End Point: R
Review for Exam 1Maps
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
What is the elevation of contour ‘k’? Answer: 650 feet
Review for Exam 1Maps
Protractor
Scale bar length = 100 mContour Interval = 50 feetElevation of point Q = 583 feet Start Point: Q End Point: R
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
What is the azimuth direction going from the start point towardsthe end point? Start Point = Q and the End Point = R The direction is about 1.5o (“1.5 degrees”).
Review for Exam 1Maps
Scale bar length = 100 mContour Interval = 50 feetElevation of point Q = 583 feet Start Point: Q End Point: R
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Maps: Distance
one inch = 2.54 cm
one mile = 5280 feet
What is the distance between points B and F in miles? Answer: The distance between points B and F is 2 ¼ inches
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
one inch = 2.54cm
one mile = 5280 feet
What is distance between points B and F in miles:
From the scale we know that 1inch:60,000inches. So for 2 inches on the map we have 120,000 inches on the ground PLUS the .25 inches which equates to 15,000 inches for a total of 2.25inches = 135,000 inches
Review for Exam 1Maps: Distance
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
The distance between points B and F in miles is: Now we convert those 135,000 inches to feet to miles
Review for Exam 1Maps: Distance
one inch = 2.54 cm
one mile = 5280 feet
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Maps: Distance
one inch = 2.54 cm
one mile = 5280 feet
What is the distance between points A and C in kilometers?
The distance in inches from point A to point C is 1 9/16 inches
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
What is the distance between points A and C in kilometers?First lets see how many map units make up 1 9/16 inches.
Review for Exam 1Maps: Distance
one inch = 2.54 cm
one mile = 5280 feet
1 9/16 = 1
X 60,000
Solve for X by cross multiplying: 1.5625 * 60,000 = 93,780 inches
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
Maps: Distance
What is the distance between points A and C in kilometers?Now we convert 93,780 inches into FEET, then into MILES and finally Miles into KILOMETERS.
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Maps: Topographic
Features
Overhanging Cliff
Gentle Slope-widely space contours
Hill
Steep Slope-narrow spaced contours
Closed Depression
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Maps
Match the following contours with the
appropriate profiles:
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Maps
Match the following contours with the
appropriate profiles:
1 B
2 E
3 D
4 C
5 F
6 A
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1
What is an outcrop?
What is bedrock?
What is the differences between the two?
►Bedrock is a layer of undisturbed rock usually located beneath a surface layer of soil or other material.
►A surface exposure of bedrock is called an outcrop.
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Geologic Map
Examine the geologic map to the left.
The numbered rectangles represent different outcrops of bedrock. Assume that each of the individual formations maintains a more or less constant thickness throughout the region.
Then connect the same formations.
http://www.brooklyncollegegeology.com/maps/geologic_maps_menu2.html
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
At drill hole E we hit Formation 1
At drill hole A we hit Formation 2
At drill hole D we hit what Formation??
Review for Exam 1Geologic Map
**Please keep in mind you must be consistent with the thicknesses of the beds as you draw your line connecting Formations.
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Locations w/in the NYC Metropolitan Area
Know all of the locations marked on the map.
http://www.brooklyncollegegeology.com/maps/nyc1a.html
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Longitude and Latitude
http://www.brooklyncollegegeology.com/maps/latlong_menu.html
Review for Exam 1Longitude and Latitude
Longitude identifies the east to west location of a point on the Earth, by measuring the angular distance from the Greenwich meridian (or Prime meridian, where longitude is 0), along the equator.
http://www.brooklyncollegegeology.com/maps/lat_long.html
BROOKLYN COLLEGE GEOLOGY DEPARTMENT
Review for Exam 1Longitude and Latitude
Latitude identifies the north to south location of a point on the Earth. Latitude can be defined precisely as the angle between the vertical at a location, and the equatorial plane of the Earth.