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CH 3 Models of the Earth. Topics. Know how latitude and longitude are set up (If given a point you should be able to find a general location on the earth) Map projections If given a projection you should be able to state what type of projection it is - PowerPoint PPT Presentation
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CH 3 MODELS OF THE EARTH
TopicsKnow how latitude and longitude are set up (If given a
point you should be able to find a general location on the earth)
Map projections○ If given a projection you should be able to state what type
of projection it is○ Explain how the different projections distort the Earth
Be able to analyze a topographic map by indentifying landforms from the contour lines
Explain the difference between soil maps and geologic maps
If given any type of map you are able to make conclusions and analysis
Latitude and Longitude Points of Interest
North and South PoleEquator- Separates North and South Pole
Latitude Run East and West (run parallel) Parallel to the equator 0º Poles are 90º N and 90º S
1º = 60 minutes 1 minute = 60 seconds Washington DC 38º53 23 N
Longitude Angular distance east or west of the
prime meridian West-East locations Established by using meridians – a
semicircle that runs from pole to pole. Prime Meridian is 0º passes through
Greenwich, England
Magnetic Compass Pg 55 Figure 4 The needle of a compass points to the
geomagnetic north pole, not the Geographic North
Pg 56 1-7 Review
3.2 Mapping Earth’s Surface Cartography- the science of making
maps. A map is a flat representation of Earth’s
curved surface. Larger the map, the larger the distortionMap of USA vs. Map of America
Map Projections A flat map that represents the 3-D
curved surface of a globe.
Cylindrical Projections Meridians, or latitude lines, would
appear straight not curved Accurate near equator, not at poles Pg 58
Azimuthal (az uh MYOOTH uhl) Projections A horizontal look at a point on the earth. Used best for the N and S Pole Cause distortions with distance and
direction. Used in air travel
Great circle is shortest distance Pg 59
Conic Projections Areas near the parallel where the cone
and globe are in contract are distorted the least.
Pg 59
Reading a Map N is always towards the top Compass Rose shows the cardinal
directions (N,S,E,W) Legend- gives symbols for features such
as rivers, mountains, and cities. Drawn to scale- MUST BE- represents
the relationship between the distance shown and the actual distance.
Isograms Meteorologists use them to show
changes in atmospheric pressure on weather maps(isobars)
Show areas that have similar measurements of precipitations, temp, gravity, magnetism, density, elevation, or chemical composition.
3.3 Types of Maps Topographic Maps
Most CommonShow the surface features, or topographyShow natural and unnatural featuresElevation- the height above sea levelPros- shows shape, size, and elevation
Question What’s the elevation at sea level?
Topography Maps Contour lines show elevation. Relief- The difference in elevation
between the highest and lowest points of the area being mapped.
Landforms Contour lines spaced widely apart
indicate that the change in elevation is gradual.
Closely spaced contour lines indicate that the change in elevation is rapid/steep
Pg 65 Figure 3
Landforms A contour line that bends to form a V
shaped valley, indicates a valley A closed loop indicates a hilltop or a
depression/dip
Symbols Built structures- black Highways- red Water- blue Forests- green Contour lines- black or brown Make sure to use the map key/legend
Geologic Maps Shows geologic features Show types of rocks, faults, folds, and
other structures
Soil Maps Based off of soil surveys The Natural Resources Conservation Service
is in charge of overseeing and compiling soil data.
Soil SurveysText, maps, and tablesText- general info about the geology, topography,
and climate of the areas being mappedTable- types and volume of soil in the areaMaps- detailed info about soil, and where they are
Pg 67